A half-hour dose of cosmic conversation with scientists, educators and students about the cosmos, scientific frontiers, scifi, comics, and more. Hosted by Dr. Charles Liu, PhD, an astrophysicist at the American Museum of Natural History. Support us on Patreon.
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How did the universe evolve, and more importantly, how might it end? To find out, Dr. Charles Liu and co-host Allen Liu welcome theoretical cosmologist and astrophysicist, Dr. Katie Mack, author of the recently published book, “The End of Everything (Astrophysically Speaking).” You’re going to need your thinking caps for this episode, because the trio get into some pretty intense and complex concepts in physics and astrophysics.
We start off this episode hearing why Katie, who grew up under the starless pink skies in LA, embarked on her journey to explore the very beginnings of existence itself. It turns out, it wasn’t the constellations or “pretty space pictures” that drew her to astrophysics, but the fact that all of the really cool, mindbending questions and extreme physics were related to stuff that happens in space like black holes and spacetime and “The Big Bang.”
For the day’s joyfully cool cosmic thing. Chuck, who studies Observational Galaxy Evolution, brings up a paper recently published in the Astrophysical Journal by Anna de Graaff et al, about the discovery, using the James Webb Space telescope, of a group of 13-billion-year-old dwarf galaxies with an unusually large amount of dark matter inside them compared to modern day galaxies. The researchers then used the Illustris cosmological simulation of galaxy formation to evolve those galaxies and found that they would end up with a percentage of dark matter that is consistent with dwarf galaxies today.
Katie talks about the value of simulations in the study of the galaxies and the early universe, especially as the simulations get better at exploring more physics, like Illustris does. The kinds of simulations she works with, though, are more simple models designed to capture the essential physics of galactic evolution.
She’s currently studying the possibility of dark matter annihilation in the early universe and what that would mean in terms of interacting with gas and energy as galaxies evolve. (At least, we think that’s what Katie’s talking about!)
Then it’s time for our first cosmological question for Katie. Ellis asks, “What’s your opinion on Block Universe theory?” Katie explains how the Block Universe theory attempts to model the past, present and future of spacetime, and how every point in space and time exists at the same time. (Again, we think that’s what she’s talking about!)
You’ll hear about physics equations that look the same forward and backward in time, the Second Law of Thermodynamics, relativity, causality, predetermination, the limits of observation, and the meaning of time itself.
Next, Chuck asks Katie about her book, “The End of Everything” and how she thinks the universe might end. The two discuss string theory, bouncing membranes, the ekpyrotic model of the universe, and other cyclical cosmological models. Katie shares how people often respond to her book from a theological perspective, including the idea of cyclical universes in religion.
Finally, this episode addresses the confluence of science, philosophy and faith, looking at life and death, religion and the divine, personal beliefs and the need many people have to find meaning in existence and possibly even objective truth.
Like we said, thinking caps! And that’s just Part 1. Join us in two weeks for the conclusion to our interview with Katie.
If you’d like to know more about Dr. Kathryn Mack and her work, check out her website, https://www.astrokatie.com/. You can also find her on Instagram and TikTok @astrokatiemack, and Twitter (X), YouTube, and Facebook @astrokatie.
We hope you enjoy this episode of The LIUniverse, and, if you do, please support us on Patreon.
Credits for Images Used in this Episode:
TNG simulation (lines and shade) versus observations (symbols) – de Graaff et al. 2024
Observers moving through a block universe – Jonathan Schooler/UCSB
Model of two branes in extradimensional space that give rise to a cyclic universe. – Princeton University
"The End of Everything (Astrophysically Speaking)" – Scribner
How do you go from a small town in Colorado to being a scientist-astronaut candidate in Australia? And how can you make space accessible for disabled astronauts? To find out, Dr. Charles Liu and co-host Allen Liu welcome scientist-astronaut candidate Celene Shimmen.
As always, though, we start off with the day’s joyfully cool cosmic thing, the new study using the James Webb Space Telescope that disproves the detection of tryptophan, a complex amino acid, in the interstellar cloud IC 348. Or, as Chuck jokes, no sleepy turkeys in space.
Then we get to meet Celene Shimmen, who is a scientist-astronaut candidate in Australia. She’s a physical therapy student who is already putting her research to work in the space industry.
Celene describes how she recently designed and implemented the Lower Extremity Motor Coordination Test in Microgravity for AstroAccess, a project she works with dedicated to promoting disability inclusion in human space exploration by paving the way for disabled astronauts. (You may remember Cady Coleman talking about working with AstroAccess in our recent episode, Sharing Space with Astronaut Cady Coleman, Part 1.
You’ll hear about Celene’s acceptance into the scientist-astronaut training program for suborbital missions with the International Institute of Astronautical Sciences, beginning in 2023. She tells us about her upcoming parabolic flight where she’ll be the principal investigator testing balance differences after acute exposure to weightlessness. Chuck asks whether the “Vomit Comet” is aptly named – Celene explains that she’ll have to let us know, since her upcoming flight will have 16 periods of microgravity.
Our first question comes from Anne, who asks, “What are some psychological or physical traits that make for a good astronaut?” Celene highlights the importance of training for strength, endurance, balance, and cardiovascular fitness, especially for upcoming, long-term missions on the moon. It turns out that while the moon has lower gravity, the encumbrance of spacesuits requires greater strength and endurance. Allen explains that lesser gravity doesn’t mitigate some aspects of force and inertia that also require physical strength.
ChuckGPT 2.0 – Three Body Problem Q&A
Saison 3 · Épisode 4
samedi 30 mars 2024 • Durée 36:55
What is the science behind the science fiction in Three Body Problem? In our second episode of “ChuckGPT” Dr. Charles Liu and co-host Allen Liu welcome two members of our production team: Jon Barnes, our Editor, and Stacey Severn, our Social Media/Patreon Community Director, to delve into the questions and answers posed by the award-winning novel and new series on Netflix.
As always, though, we start off with the day’s joyfully cool cosmic thing: the recent discovery of an exoplanet by high school students in Mountain View, California in collaboration with the SETI Institute.
The search for extraterrestrial intelligence and exoplanets that could bear life brings us to the topic of our second episode of ChuckGPT: Three Body Problem. Dr. Liu will be answering questions about the Hugo award-winning Chinese novel by Liu Cixin and new television series on Netflix.
Jon, it turns out, is a big fan of Three Body Problem and he has a bunch of questions about the scientific reality of the science fiction in the story, which Chuck and Allen are happy to answer. (NOTE: We tried to avoid any spoilers for anyone who hasn’t read the book or seen the first three episodes of the series yet, except for the last question, which comes with a mild SPOILER ALERT.)
Jon’s first question deals with the giant antenna on Radar Peak in the story. In the series, the antenna is turned on and a flock of birds flying by drop dead as they pass.
Chuck dives into the physics of both microwave radiation and radio waves, and why even our most powerful transmitters don’t emit enough energy to have that kind of impact. Allen describes the difference between ionizing radiation and non-ionizing radiation, further pushing the answer into the realm of science fiction, not science. Stacey asks about the relationship between magnetic fields and bird migration – Chuck explains that it is possible that magnetic transmissions could disorient the birds, but not kill them.
The next question is about whether suns can come in different colors like in the “Three Body” VR game in the story. The answer, according to Dr. Liu, is, yes – but primarily only because of their surface temperature, not their chemical makeup. Allen brings up the impact of the viewer’s atmosphere on their color perception of the star’s light.
Ancient Astronomy with Hannah Liu
Saison 3 · Épisode 3
samedi 16 mars 2024 • Durée 39:24
What does the study of archeology, the study of the human past, offer to the astronomers of today? To find out, Dr. Charles Liu and co-host Allen Liu welcome archaeology expert Hannah Liu, MEd, to connect the past, the present, and the future of astronomy in an episode Allen has described as, “A Fistful of Lius.”
As always, though, we start off with the day’s joyfully cool cosmic thing, a recent scientific paper just published by archaeologist Federico Bernardini and astronomer Paolo Molaro which suggests that a 3,000-year-old stone tablet discovered near Trieste, Italy may be the oldest European star chart yet discovered.
Hannah, who is an expert in archaeology, takes us back to the hilltop area where the tablet was found, which had been occupied since the Iron Age, and was more than likely a farming area. She explains how early civilizations used the stars to keep track of planting and threshing seasons, which could support the theory that the tablet has an astronomical purpose.
Then, it’s time for our first question. Hannah teaches History at the Pingree School in South Hamilton, Massachusetts, which is where we got the questions we answer on today’s episode. Maeve asks, “Are we the only living things on earth who have a sense of how small we are in the universe?”
The Lius answer includes ancient Greeks, sea turtles who use stars for directions and moths that fly towards light thinking it’s the moon, and the beginnings of astronomy and astrology! Hannah explains how constellations and asterisms are cross-cultural, even though they have different names. In particular, The Pleiades is an example of star cluster relevant to cultures around the world.
Coming back to that 3000-year-old star chart, Hannah breaks down the 29 markings on the tablet, and how 28 of them are connectable to constellations that we know like Scorpius, Cassiopeia The Pleiades, and Orion. However, the 29th marking, near Orion’s Belt, still remains a mystery, and until we can pin it down, we can’t definitively claim it’s really a star chart.
Lucy and L'SPACE with Freya Holloway
Saison 3 · Épisode 2
dimanche 3 mars 2024 • Durée 35:40
How can college students who would like to work in the space industry and at NASA get their foot in the door? And what is the purpose of the Lucy mission to the Trojan Asteroids? To get the answers to both of these questions, Dr. Charles Liu and co-host Allen Liu welcome Freya Holloway, a NASA L’SPACE Lab Tech at ASU.
As always, though, we start off with the day’s joyfully cool cosmic thing: the latest, most accurate coloration of Neptune. It turns out, the rich, deep blue Neptune we’ve come to know and love was placed by scientists to increase contrast which are no longer necessary. And Neptune is now a much lighter tone of blue, more in line with the current, turquoise coloration of Uranus.
And with that, we turn to the Lucy mission to investigate the “Trojan Asteroids” which share Jupiter’s orbit around our sun. Lucy recently did a flyby of the asteroid Dinkinesh and its moon Selam, discovering that it actually not one asteroid but three distinct bodies. Freya Holloway is an ambassador for Lucy, and she explains the purpose of the flyby and brings us up to speed on where the mission is at. In December this year, Lucy will be making her second Earth gravity assist flyby to build up momentum to slingshot her towards Jupiter. And in April 2025, Lucy will encounter her second main belt asteroid, Donald Johanson. That asteroid is named for the paleontologist involved in the discovery of the Lucy fossil (the mission’s namesake) in Ethiopia in the 1970s, and who has actually been involved in the current Lucy mission.
Freya explains why the mission is aptly named. Trojan asteroids are fossils, astronomically speaking, and they may be able to teach us something about the birth and evolution of our solar system the same way that Lucy has taught us about early hominids and our own evolution.
You’ll learn all about this unique population of asteroids, which are far less familiar to most people than either the main asteroid belt between Mars and Jupiter or the Kuiper Belt beyond Neptune. One group precedes Jupiter in its orbit around the sun and the other orbits behind, and both groups are relatively pristine and date back to the origins of our solar system.
In this episode, we have a special set of questions for Freya that all come from students who attend Notre Dame Academy on Staten Island. First up, Isabella wants to know who Freya’s favorite scientist is, and also, does she have a favorite song to listen to while studying. Freya tells us about Dr. Eugene Parker, the heliophysicist who predicted the existence of the solar wind and after whom the Parker Solar Probe and the “The Parker Instability” is named. For the second part, Freya listens to David Bowie’s “Let’s Dance” as a pick me up for long study sessions.
Solar Flares and Deep Space Nine with Dr. Jimmy Negus
Saison 3 · Épisode 1
dimanche 18 février 2024 • Durée 27:23
Welcome to the Season 3 premiere of The LIUniverse, your happy half-hour dose of cosmic conversation and geeky banter with host Dr. Charles Liu! In this episode, Chuck and co-host Allen Liu welcome back Dr. Jimmy Negus, who was our guest on our very first episode, to talk about Solar Flares, “Deep Space Nine,” and more.
As some of you may remember, Jimmy was only a PhD candidate back then, with his research focused on active galactic nuclei, including black holes, quasars and more. Now that he’s got his doctorate, Jimmy has pivoted to studying solar physics, which is the perfect lead in to discuss the upcoming Great American Eclipse, the total solar eclipse on April 8, 2024 that has them – and the rest of America – buzzing with excitement.
As always, though, we start off with the day’s “Joyfully Cool Cosmic Thing” – the discovery of a pulsar in a binary system with an unknown and mysterious object that seems to be somewhere between the mass of a neutron star and a black hole by astronomers using the radio telescopes in the MeerKAT array in the South African Radio Astronomy Observatory (SARAO). Jimmy explains that the leading theory may be that it is a smaller mass black hole than we’ve yet observed that was created by the collision of two neutron stars. Special thanks to our friends at the All Things Unexplained podcast (@allthingsunexplained) for bringing today’s JCCT to our attention!
Our first question of the day – and the season! – comes from audience member Makalya, who asks, “What are the chances of having black holes consume each other, becoming giant black holes, and slowly start growing from there?”
Pretty high, it turns out. Dr. Negus explains how we use gravitational waves to deduce the frequency of black hole mergers in the universe. If we look across the entire observable universe, there are between 200,000-400,000 mergers EVERY YEAR! Of course, that includes all types of black holes. If we’re only looking Jimmy estimates only about 10% of that number are collisions of supermassive black holes. And we’ve got a little while before that happens to our supermassive black hole, which will someday collide with Andromeda’s – something on the order of 4 billion years or so.
Moving on, Jimmy tells us about his new gig at The University of Colorado, Boulder, where he stayed on as a research faculty member after getting his PhD. He’s now analyzing, calibrating and validating data from NOAA’s GOES-18 satellite (GOES is a suite of Geostationary, Environmental Operational Satellites, the longest running continuous stream of satellites, first launched in 1974.) In addition to its weather-sensing technology that points down at the Earth, the satellite carries X-ray and UV sensors that point towards the sun to track space weather.
Chuck GPT 1.0 Year End Q&A
Saison 2 · Épisode 15
samedi 30 décembre 2023 • Durée 49:55
What happens to one sun of a binary pair if the other goes supernova? Can we mitigate the greenhouse effect? How big should a telescope be? For our Season 2 finale, we’re answering fan questions from YouTube, Instagram, and Facebook. To bring those questions to life, Dr. Charles Liu and co-host Allen Liu welcome two members of the LIUniverse social media team, “Vinyl Benjy” Schoenfeld, our TikTok manager, and Stacey Severn, our Social Media Director.
As always, though, we start off with the season’s final joyfully cool cosmic thing, the most recent image of Uranus by the James Webb Space Telescope. Taken using the JWST’s infrared imaging capabilities, rather than visible light, this incredibly beautiful photo of Uranus clearly shows its 7 spectacular rings and 14 moons.
Now, on to your questions! First, Stacey reads a question from YouTube fan Darker Void Scientist, who asks, “Wouldn’t some violently spinning galaxies produce strong magnetic fields that act as a barrier to some spectrum of traveling waves?”
To answer, Charles gets to discuss the Zeeman Effect and the Parker Instability. He explains that entire galaxies can’t spin fast enough, but that violent spinning does occur and produce magnetic fields closer to the supermassive black holes in the center of those galaxies.
Benjy reads our next question, from YouTube fan Mark Caesar 4443: “When stars go very near black holes and get sling-shotted around them, what would we see of them in terms of time dilation? Surely we would see them slow down as they approach the black hole, of course, that is assuming we can actually observe them.”
Chuck dives into what we would be able to perceive at all, from our perspective, and why we would see color shifts but not necessarily the impact of time dilation that the star itself would experience.
Allen tackles the next question, from Randy Starnes on Facebook, who wants to know whether we could take a rechargeable battery and use it to power a plasma rocket. Our co-host explains that while rechargeable batteries wouldn’t generate enough energy for a plasma engine, lithium-ion rechargeable batteries are used by Rocket Lab for the electric pumps on their reusable Electron rockets.
Star Trucking with Franklin Chang-Diaz and Miranda Chang – Part 2
Saison 2 · Épisode 14
samedi 16 décembre 2023 • Durée 31:48
Welcome to Part 2 of our interview with father and daughter team Franklin Chang-Diaz, NASA astronaut and founder of the Ad Astra Rocket Company™, and Miranda Chang, Ad Astra’s Global Communications Director.
We pick up where we left off, with a focus on fathers working with their children! Host Charles Liu shares how much he loves doing The LIUniverse with his co-host and son Allen, while Franklin talks about how important Miranda is to the running of Ad Astra.
Then it’s on to our next question, from Ebony, who asks, “Do you believe that traveling to space can find ways to fix the problem with climate change?” Franklin begins by reminding us that we would not be aware of climate change if we were not exploring space. And then he describes how the life support system on spaceship Earth is in need of a great deal of maintenance and repair, how at some point there will be more humans than can survive on it, and how he worries that we will damage our environment to the point that our civilization won’t be healthy enough to explore space and then we will be doomed.
In Costa Rica, Ad Astra is working to transition the country to a green, hydrogen economy. Using solar and wind energy, they generate hydrogen from water, to power their fleet of hydrogen-powered vehicles and fuel cell electric buses. Miranda points out that Costa Rica’s electric grid is already nearly 100% renewable, making it a perfect based for doing test projects like these with the goal of reducing carbon.
Miranda discusses ways to make the economy of space more sustainable, too, and describes the fuel efficiency of the VX-200 VASIMIR engine (Variable Specific Impulse Magnetoplasma Rocket), their new high-power, electric in-space propulsion system that will have a thirteen-year lifespan.
Chuck asks Franklin how me made the transition from astronaut to environmentalist. Franklin explains how the Overview Effect impacted him, and how he came back from space with a tremendous awareness of our environmental problem. Charles brings up the differences between the Gaia Hypothesis and the Medea Hypothesis, which says the Earth may be out to get us and will be fine without us.
Somehow, the conversation leads to “The Inner Light” – one of the most beloved episodes of Star Trek The Next Generation, which had tremendous but differing impacts on Franklin and Charles. In the episode, a civilization ignores climate change to the point where it is too late for them to do anything except memorialize their lives and their fate. Miranda talks about the unifying impact of space exploration, and the necessary realization we must reach if we are to survive that we are one species all in this together.
Star Trucking with Franklin Chang-Diaz and Miranda Chang – Part 1
Saison 2 · Épisode 13
dimanche 10 décembre 2023 • Durée 34:08
When humanity heads out for the stars, what will be powering our spacecraft? To find out, Dr. Charles Liu and co-host Allen Liu welcome father and daughter team Franklin Chang-Diaz, NASA astronaut and founder of the Ad Astra Rocket Company™, and Miranda Chang, Ad Astra’s Global Communications Director for Part 1 of this two-part episode. (We’ll be posting Part 2 next Saturday!)
As always, though, we start off with the day’s joyfully cool cosmic thing. Lucy, the robotic NASA mission to the asteroid belt, just passed by its first asteroid Dinkinesh (which has been given the Ethiopian (Amharic) name for the human-ancestor fossil known as Lucy and means “You are marvelous”!). As it did so, it discovered Dinkinesh is actually a double asteroid, in that it has its own orbiting moon, Selam, but that’s not all: Selam is a contact binary, meaning it’s actually two distinct bodies touching each other but not connected.
Next, we turn from discovering asteroids to visiting them, and that’s where Franklin and Miranda come in. Franklin spent 25 years at NASA. He was one of the ninth group of astronauts, the class of 1980, and flew 7 missions in space, the most spaceflights anyone has taken to date. An astronautic jack-of-all-trades engineer, physicist and more who describes himself as a “glorified plumber/electrician”), Franklin flew on each of the Space Shuttles except the Challenger, visited the Soviet space station Mir, took 3 spacewalks and even helped build the International Space Station.
Miranda tells us about Ad Astra’s flagship program, the VX-200 VASIMIR engine (Variable Specific Impulse Magnetoplasma Rocket), a new type of high-power, electric in-space propulsion. They’re vastly more powerful (compare a hair dryer to a diesel engine) and more efficient than existing ion propulsion systems.
We jump right into audience questions with one from Mohammed, who asks, “Engineering is problem solving. What happens when you can’t solve the problem?” According to Franklin, “In space, you work the problem until you find a solution and you never stop...eventually, you have to find something.” Miranda adds, “The whole idea of engineers is that there is never “no solution”...The are always working to find a solution...every time I think we’re don, there is no solution for that, they have like three...” Franklin also takes on the NASA mantra, “Failure is not an option.” In his experiences, “Failure is how you learn.... giving up is not an option.”
Black Holes and Space Junk with Vivienne Baldassare
Saison 2 · Épisode 12
dimanche 19 novembre 2023 • Durée 34:32
How do we find black holes? And how can we tell whether it’s a small black hole “eating” really fast or a large black hole that’s eating very slowly? To find out, Dr. Charles Liu and co-host Allen Liu welcome astrophysicist Dr. Vivienne Baldassare, a professor of astronomy and physics at Washington State University.
As always, though, we start off with the day’s joyfully cool cosmic thing, the recently published composite photo of the X-ray Binary System in nearby starburst galaxy NGC_4214. Vivienne explains how X-ray Binaries, which are relatively rare, are created by a stellar mass black hole or a neutron star being fed by a star.
Chuck and Vivienne discuss the differences between using the new James Webb Space Telescope and “old tech” like the Hubble Space Telescope and the Chandra X-ray Observatory, and how she uses Chandra to find black holes. Professor Baldassare explains how she uses x-ray observations, optical spectroscopy, and variability data to find intermediate-mass black holes, which she is one of the first astronomers to find. You’ll hear about the differences between stellar mass black holes, supermassive black holes, and the intermediate-mass back holes that fit somewhere between.
Then it’s time for our first student question, from Lorenzo, who asks, “Are stars only found in galaxies, and if not, where else?” Vivienne explains that most stars are found in galaxies, but they can also be found in globular clusters. There are also hyper-velocity stars, which can be found in the halo of our galaxy on their way to escape our galaxy entirely.
A discussion of the Chandra X-ray Observatory, which spends about 80% of its time outside the Van Allen belts, turns into a discussion about all the manmade objects orbiting the Earth, including Chandra, Hubble, satellites... and lots of space junk, too. We’ve currently got about 8,000 satellites orbiting Earth – a surprising amount of which are SpaceX Starlink satellites, with more “satellite constellations” planned by SpaceX and others. You’ll find out about the risk of chain-reaction debris collisions due to solar storms and other disruptive events, Kessler Syndrome, the environmental consequences of mostly-aluminum satellites burning up in our atmosphere, and the first fine every levied for space junk, against Dish Network.
Celene describes the psychological aspects of being an astronaut, and the need for mental resilience to cope with isolation and stressful situations, as well as problem solving skills and the ability to work as part of a team.
You’ll also find out about Celene’s journey from growing up in a single-wide trailer in a town of 1000 residents in Colorado to studying hospitality in the Disney College Program in Florida, where she met her Australian husband. After watching “First Man”, the movie about Neil Armstrong, Celene decided she wanted to get into the space program. She applied to and was accepted by the Melbourne Space Program, working on a nano-satellite program. She also helped a humanoid robot take its first step, which inspired her to get involved with physiotherapy and the human body in space.
Our next question is from “anonymous”: What part of the human body is most vulnerable in space? Celene explains that extended exposure to microgravity leads to muscle atrophy and bone density loss, which is still a big issue even with ongoing exercise. Even just a 14-day stay in space leaves returning astronauts with muscle weakness.
Finally, we hear about Celene’s desire to be deployed to the moon, should the opportunity arise. Upcoming lunar missions to the moon will likely last about 30 days each, including 7 days of activity on the lunar surface.
If you’d like to reach out to Celene and chat, you can follow her on Instagram @spaceptcelene and on LinkedIn and Facebook as Celene Shimmen.
Jon’s next questions is about lifeforms that can dehydrate themselves to survive unstable, life-threatening weather cycles and atmospheric conditions. Allen brings up the fact that tardigrades can do exactly that, allowing them even to survive in the vacuum of space. He also discusses some of the chaotic orbits we know about that could result in stable and unstable orbital periods.
Next up, Stacey asks one of Jon’s questions about whether snowflakes could be made of nitrogen and oxygen if the atmosphere is cold enough. The answer takes us from the nitrogen glaciers on Pluto to the methane rivers on Saturn’s moon Titan. And yes, depending on atmospheric pressure and temperature, there is a specific range where you could end up with nitrogen and oxygen snow.
For his last question (SPOILER ALERT), Jon asks about whether an advanced civilization could send out a message at the speed of light, and if so, could they use their sun as an amplifier to increase the strength of the signal. Allen and Chuck discuss how you might be able to use the sun for gravitational lensing, but that it would be more likely to drown out the signal than amplify it.
We hope you enjoy this episode of The LIUniverse, and, if you do, please support us on Patreon.
Credits for Images Used in this Episode:
– The Electromagnetic spectrum. Higher energy is to the right. – Edited from NASA, Public Domain
– Janus and Epimetheus viewed by the Cassini probe – NASA/JPL/Space Science Institute, Public Domain
– Orbit of 469219 Kamoʻoalewa, an Earth quasi-satellite – NASA/JPL-Caltech, Public Domain
– A tardigrade – Peter von Bagh, Public Domain
– Pluto with its heart shaped Tombaugh Regio – NASA/JHU APL/Southwest Research Institute/Alex Parker, Public Domain
– The surface of Titan from the Huygens lander – ESA/NASA/JPL/University of Arizona; processed by Andrey Pivovarov, Public Domain
– A galaxy acting as a gravitational lens – ESA/Hubble & NASA, Public Domain
Our next question comes from Abby, who asks, “Where do you think human involvement in space exploration is going?” Allen runs down the planned manned missions beyond low Earth orbit, where we haven’t gone since our last trip to the moon in 1972, along with the reasons we haven’t. We also hear how the stars were very important to ancient explorers like the Greeks and the Phoenicians, as well as the ancient Polynesian Wayfinders, who used the stars as their guides in their ongoing excursions around the world.
After brief sojourns into Star Trek and The Odyssey, we dive into ancient alien visitors, gods, and supernatural forces. Hannah points out the inherent Western biases in theories that “ancient aliens” were responsible for building the Pyramids and other impressive accomplishments that just happened to have been created in non-Western cultures of the past.
Charles explains that in the past, some people who used science and astronomy, like midwives and scientists, were accused of witchcraft and other equally disparaging and unfounded claims. This could create a divide between science and religion, but luckily, not an unbridgeable one – you’ll hear about Gerbert of Aurillac, a scientist who became Pope Sylvester II and brought the Abacus back to Europe, and how the Catholic Church itself established the Vatican Observatory which has made numerous discoveries over the years.
Finally, we get into the history and anthropology of museums, a subject about which Hannah will be teaching a course in the upcoming semester. What is the role of a museum? Is it science, education, or something else? Is it a place where we hold our treasures, or, increasingly, one where we recognize we hold other people’s treasures, some of which were once plundered and taken from those people against their desires? And yes, we do bring up situations like the Elgin Marbles and the British Museum’s refusal to return those artifacts to Greece... especially in light of the new U.S. law regarding repatriation of artifacts.
We hope you enjoy this episode of The LIUniverse, and, if you do, please support us on Patreon.
Credits for Images Used in this Episode:
– 3,000-year-old stone tablet from Italy – Bernardini et al., CC BY-SA 4.0
– Trieste in Italy – F l a n k e r, Yiyi, and Allen Liu, Public Domain
– Sirius (bottom) in the night sky – Akira Fujii, Public Domain
– A thresher (Thanks Jon.) – SteveStrummer, Public Domain
– NASA’s SLS Rocket – NASA/Joel Kowsky, Public Domain
– SpaceX’s Starship rocket under construction – NASA, Public Domain
– Austronesian societies range – Obsidian Soul, CC BY 4.0
– Gerbert of Aurillac, Pope Sylvester II – Meister der Reichenauer Schule, Public Domain
– Vatican Advanced Technology Telescope in Arizona – Andromeda321, Public Domain
– Parthenon Marbles at the British Museum – Ejectgoose, Public Domain
– Map of Latin-descended languages in Europe – Servitje, Public Domain
For the first time in the history of The LIUniverse, Charles then brings up a second joyfully cool cosmic thing: the recent meteor (a bolide) that broke up over Germany whose pieces have been collected, many by students! It turns out that Freya collects meteorites, although none which she found on her own. Her favorite is the lunar meteorite she keeps on display at home.
The next question from Notre Dame Academy comes from Caitlin Sweeney, who asks Freya, “What’s the coolest thing about labs in college?” Freya describes how, compared to high school, labs in college are her favorite part of college and are much more interactive.
Another Notre Dame Academy students asks, “What was the biggest challenge you overcame and how did you learn from it?” For Freya, that was finding her place in the academic and professional world. She tells the story of how in 2015, she was a single mom with two young children, one of whom was 8 and just diagnosed with leukemia who lost her job she loved in finance at the Columbus Ohio Zoo. She made the decision to show her children that no matter what life throws at us, we can still be who we want to be, and she enrolled in college and embarked on an entirely new direction.
As a student, Freya applied for and went through the NASA L’SPACE Program (Lucy Student Pipeline Accelerator and Competency Enabler), a workforce development program that consists of two academies. In one, the Mission Concept Academy, students work as a team to complete a mission task. In the other academy, students will work as a team to introduce new technology ideas to NASA. NASA chooses a winner each semester and gives them a $10,000 seed fund to develop the idea. After completing the Academies, Freya became an intern on the Lucy mission. She began as a Lucy ambassador, and then came back to serve as an outreach mentor and a student success advisor.
If you’re a student of at least 18 years of age and enrolled in a US college or university and you’d like to learn more about NASA’s L’SPACE Program, visit their website at lspace.asu.edu. You can follow them on Instagram @l_spaceprogram, where Freya helps manage the account, or at NASA L’SPACE Program on LinkedIn and Facebook.
We hope you enjoy this episode of The LIUniverse, and, if you do, please support us on Patreon.
Credits for Images Used in this Episode:
– Neptune calibrated in true color – NASA w/ color by Ardenau4, Public domain
– Neptune in exaggerated color – NASA, Public Domain
– Uranus in true color – NASA w/ color by Ardenau4, Public domain
– The Lucy spacecraft – NASA, public domain
– Dinkinesh and its moon Selam – NASA/Goddard/SwRI/Johns Hopkins APL, public domain
– The Lucy fossil – 120 on Wikimedia commons, CC BY 2.5
– Diagram of the main belt and Trojan asteroids – Mdf at English Wikipedia, Public Domain
– Dr. Eugene Parker in 2018 – NASA, public domain
– Model of the Parker Solar Probe – NASA, public domain
– A bolide in the sky – Thomas Grau, Public Domain
Next up, we turn to the impending Solar Max period of our solar cycle, where the magnetic field of the sun completely flips every 11 years. Jimmy discusses the 2025 peak of the solar cycle, how solar emissions like X-Class Solar Flares can impact us. Charles points out that previous solar maxes have even taken down satellites, and Jimmy describes various ways we work to mitigate the damage from the next flare.
Speaking of which, for our next question Shana asks whether a solar flare can set her phone on fire. Jimmy explains why we’re not in danger here on Earth, thanks to technological advancements, but that a satellite disruption could disrupt service temporarily. He describes the Carrington Event of September 1859 during solar cycle 10, which was the most intense geomagnetic storm ever recorded, and actually caused some telegraph wires to burst into flame.
Finally, Chuck turns our focus to our obsession with science fiction. We revisit “The Expanse,” which Jimmy just finished watching, and while good, “certainly wasn’t a perfect show. It wasn’t “Deep Space Nine,” my favorite.” Chuck posits that Voyager was better, but the two wisely reserve judgment on the new Star Trek shows and sticking with the classics.
Stacey next asks another question from YouTube, from @sbkarajan: “How do NASA or anyone measure distance from the planet to the Sun? I heard for Earth they measure the distance to Mars or Venus transit using Keppler’s Third Law. Is it the only way?”
Chuck explains that when humanity was still stuck on Earth, that was the only way. But since we have more tactics at our disposal, from satellites to radar signals, to do far more accurate measurements, even at vast distances.
Next up, @frankwestphal8532 from YouTube: “What would happen to the other star in a supermassive star binary system if one of the stars ‘supernova-ed’ before the other?” It turns out that happens all of the time... and none of the outcomes tend to be good for the other star. But Frank’s not done, and his follow up question about the early universe, binary-system supernovae, and the creation of supermassive black holes is a bit of a chin-scratcher for Chuck!
Stacey’s next question comes via Instagram from our friends CJ Dearinger and Dr. Mounce on the “All Things – Unexplained” podcast: “When will astrophysics encounter/present undeniable proof of a new life form?” Predictions, obstacles, and discussion of alien cryptids ensue.
In another Instagram question, Ben Jordans asks, “How do you perceive the current efforts to mitigate the greenhouse effect? Are you of the opinion that we will succeed in mastering this problem, and if so, how?”
Chuck explains the greenhouse effect, on Earth as well as on Venus and Mars, and the difference between the effect itself and human involvement in it. He and Allen disagree as to how long it might take to redress the problem, while Stacey and Benjy jump in with their more pessimistic concerns about climate change, extreme weather, and the future.
Benjy gets the last question, from @emiliotorres2718 on YouTube: “How do we go about deciding how big we want a telescope to be? Is it simply the bigger the telescope we make, the farther we’ll be able to see into the universe?”
Chuck says the simple answer is yes, but the actual answer is more complicated. To hear it, you’ll have to watch or listen in to the final episode of Season 2 of The LIUniverse!
We hope you enjoy The LIUniverse, and, if so, please support us on Patreon. We’ll return for Season 3 in 2024.
Image Credits:
–Uranus and moons by JWST – NASA, ESA, CSA, STScI, Public Domain
–Time-lapse of stars near Milky Way’s central black hole – ESO/MPE, CC BY 4.0
–Rocket Lab’s Electron rocket – NASA Kennedy Space Center / Rocket Lab, Public Domain
–The Hobby–Eberly Telescope – Zereshk, CC BY 3.0
–3D model of Parker Solar Probe – NASA, Public Domain
–Chandra X-ray Observatory on the Space Shuttle – NASA, Public Domain
–Hubble photo of Saturn in UV light – NASA, Public Domain
Finally, we turn to VASIMIR. Chuck wants to know how it will change our lives, and Franklin likens it to the trucking business that sprung up after WWII because of the availability of diesel engines. As of right now, he explains that we don’t have an equivalent for space: “We still fly to space in cannonballs.” What we want, he says, is powered flight over longer periods of time, which VASIMIR makes possible, changing the entire economics of space and enabling humans and the private sector to engage in sustained activity in space.
Franklin explains how VASIMIR may someday reduce the time from the Moon to Mars from 8 months to 2 months or less and catalyze the next period of humanity’s expansion into our solar system. In fact, it turns out that the engine Andy Weir used in his book The Martian was based on VASIMIR!
To find out more about Ad Astra, visit their website, www.adastrarocket.com, or follow them on social media at @adastrarocket on YouTube, Instagram and Twitter, and @asastrarocketcompany on Facebook and LinkedIn.
We hope you enjoy this episode of The LIUniverse, and, if you do, please support us on Patreon.
Credits for Images Used in this Episode:
– Apollo 17’s Blue Marble photo of the Earth – NASA, Public Domain
– Crew of STS-60, first launch with US and Russian spacefarers – NASA, Public Domain
You’ll also hear about Miranda’s role and how creative storytelling is a critical aspect of helping people understand the complex technical realities of space exploration and the advanced propulsion systems and orbital mechanics Ad Astra deals with.
Miranda explains how Franklin got into the science of propulsion, and how he had started working on the VASOMIR engine even before he joined NASA. He was an engineer who spent a lot of time in the physics laboratory, and he came from Costa Rica specifically to become an astronaut during the burgeoning interest in space exploration during the period of the Apollo program.
That’s it for Part 1. Please tune in next Saturday for the conclusion.
We hope you enjoy this episode of The LIUniverse, and, if you do, please support us on Patreon.
Credits for Images and sounds Used in this Episode:
– NASA’s 1980 astronaut group, including Franklin – NASA, public domain
– Lucy spacecraft – NASA, public domain
– Lucy/Dink’inesh fossil – 120 on Wikimedia commons, CC BY 2.5
– Dinkinesh and its moon Selam – NASA/Goddard/SwRI/Johns Hopkins APL/NOAO, public domain
– Dinkinesh and Selam from the side – NASA/Goddard/SwRI/Johns Hopkins APL, public domain
– Franklin on a spacewalk (EVA) – NASA, public domain
– Canadarm 2 on the ISS – NASA, public domain
– Ad Astra’s VX-200 VASIMR test engine – Ad Astra Rocket Company™, from online media gallery
– NEXT, a typical electric ion engine – NASA, public domain
– STS-111, Franklin’s last shuttle launch – NASA, public domain
For our next student question, Adrian wants to know how tiny black holes can swallow super giant stars? Vivienne explains how tidal disruption, when the gravity on one side of an object is greater than on the other side, can pull a star apart in months or even weeks!
Finally, Vivienne talks about being an ultra-marathon runner and a trail runner, hiking with her dog, and the importance of being able to go out to wild spaces in nature. Chuck gets here to share a favorite hiking memory – a 7-day, long distance solo hike around Mt. Blanc after presenting her work at a conference in France.
If you’d like to know more about Dr. Baldassare, you can follow her on Twitter @vbaldassare, Instagram @vbaldassare, or her website which includes her email for you to reach out to her and ask her more questions.
We hope you enjoy this episode of The LIUniverse, and, if you do, please support us on Patreon.
Credits for Images Used in this Episode:
– NGC_4214 (X-ray binary circled) –NASA, ESA and the Hubble Heritage Team (STScI/AURA)-ESA/Hubble Collaboration, Public Doman
– Artist’s impression of an X-ray Binary – Dana Berry/NASA Goddard Space Flight Center, Public domain
– Launch of Hubble on shuttle flight STS-31 – NASA, Public Domain
– Illustration of the Chandra X-ray Observatory – NASA/CXC/NGST, Public Domain
– Our Milky Way’s central black hole – EHT Collaboration, CC BY 4.0
– Globular cluster NGC 1466 – ESA/NASA (Hubble), Public Domain
– Orbit of the Chandra X-ray Observatory – NASA, Public Domain
– Starlink trails on a CTIO telescope image – NSF’s National Optical-Infrared Astronomy Research Laboratory/CTIO/AURA/DELVE, CC BY 4.0
– Diagram of tides in Earth’s oceans – Orion 8 on Wikimedia Commons, Public Domain
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