Explore every episode of the podcast Gravity Assist

On the Gravity Assist podcast we have interviewed dozens of scientists, engineers, and others dedicated to the mission of NASA space exploration. After five years, the show is coming to a close. Here are some final thoughts and episode highlights from the podcast team.

The James Webb Space Telescope awed the world on July 12 with its first images and data. And it’s just getting started with its exploration of the cosmos. Dr. John Mather, the observatory’s senior project scientist, has been working toward this milestone for more than 25 years.

The James Webb Space Telescope, which launched Dec. 25, will allow us to see the farthest galaxies and better understand the origins of the Milky Way. Aaron Yung at NASA’s Goddard Space Flight Center is preparing for these historic observations by simulating what Webb will see in the early universe.

In space, we have to expect the unexpected. Sunny Panjwani of NASA’s Johnson Space Center shares how he got thrown into an emergency situation on his first day as a flight controller. His team makes sure that astronauts have a safe environment on board the International Space Station.

Climate change is one of the most important issues facing our planet, and NASA has lots of space missions and programs in the works to monitor and understand its drivers and effects. Kate Calvin, NASA’s new chief scientist, is also the agency’s senior climate advisor. In this episode, Kate previews  upcoming Earth science missions and discusses cut

NASA is about to launch a new spacecraft to look at the universe in X-ray light. The Imaging X-Ray Polarimetry Explorer, IXPE, will look at extreme objects such as black holes, neutron stars, and supernovae, asking fundamental questions about how high-energy light gets produced.

NASA’s Double Asteroid Redirection Test Mission, or DART, will deliberately impact a small asteroid called Dimorphos to deflect its orbit around a bigger object, Didymos. Nancy Chabot, planetary scientist at the Johns Hopkins University Applied Physics Laboratory, has the details.

As NASA prepares to send astronauts to the Moon through the Artemis program, engineers are working on technologies that will give these explorers power – solar power, that is. In space, the harsh radiation and huge temperature changes make for a challenging environment.

Yaireska Collado-Vega leads a team at NASA’s Goddard Spacecraft Center that is studying the solar weather environment so that robots and people exploring space can be protected. In this episode of Gravity Assist, she describes the excitement and challenges of understanding space weather, and how she got to be a NASA scientist.

To get a more complete understanding of the full history of our solar system, NASA is sending a spacecraft called Lucy to investigate the Trojans, mysterious small objects that share an orbit of the Sun with Jupiter. Principal investigator Hal Levison of the Southwest Research Institute

Janelle Wellons likes to say that she operates “fancy space cameras.” At NASA’s Jet Propulsion Laboratory, she creates commands that allow spacecraft to take valuable scientific data in our solar system and here at planet Earth.

The laws of physics get very, very weird in the realm of particles too small for the eye to see. Aboard the International Space Station, an experiment called the Cold Atom Laboratory (CAL) is exploring how the universe works .

The world will get a first glimpse of the universe as never before when the first images from the James Webb Space Telescope come out on July 12. And this is only the beginning — the telescope will deliver all kinds of insights about galaxies, planets, and more, for years to come.

In honor of National Intern Day, Gravity Assist features Felicia Ragucci, an undergraduate at Dartmouth College who recently completed an internship with NASA’s History Office and the Office of the Chief Scientist. During her time at NASA, Felicia researched the history of the Neutral Buoyancy Simulator, an underwater training facility where astron

NASA is sending two missions to Venus this decade and participating in a European Space Agency mission there, too. Lori Glaze, director of planetary science at NASA, discusses these missions and why she’s so excited about what we’re about to learn.

The idea for NASA’s Mars Ingenuity helicopter began at the Jet Propulsion Laboratory with a team of dedicated engineers who believed in something seemingly impossible. MiMi Aung served as the project manager on the helicopter, which has now achieved nine flights on Mars.

Scientists will soon have the opportunity to visit a unique object in the asteroid belt called Psyche, which may be the exposed metallic core of a planetary body that stopped growing before it became a big planet like Earth. Dr. Lindy Elkins-Tanton explains.

What’s the difference between climate and weather? How does NASA monitor changing sea levels, melting glaciers, and other effects of climate change? Gavin Schmidt, NASA’s acting senior climate advisor, explains how rising temperatures lead to many complex changes both in the oceans and on land.

How do astronauts exercise on the International Space Station? How do they train underwater? Tara Ruttley, associate chief scientist for microgravity research at NASA Headquarters, has worked on a lot of fascinating projects to support the human spaceflight program.

When future astronauts explore the surfaces of the Moon, Mars, or beyond, they’ll have big challenges communicating with Mission Control back on Earth.

NASA spacecraft deliver stunning visual imagery of the cosmos, but we can also experience that data by turning it into sound.

In some ways, spaceflight changes you forever,” says Ken Bowersox. Since he was 7 years old, Ken knew he wanted to become an astronaut. In his astronaut career, he participated in many exciting missions, including an extended stay on the International Space Station.

Dana Bolles has worked in many exciting areas of NASA including assuring the safety of experiments and spacecraft going to space, managing environmental programs, and thinking about the possibility of life beyond Earth.

Uranus and Neptune are two of the many exciting and mysterious objects in our universe that the James Webb Space Telescope will soon begin to explore. Learn more about these planets and the Webb telescope’s upcoming observations from astrophysicist Naomi Rowe-Gurney, our guest on this week’s Gravity Assist.

The Ingenuity helicopter made history on April 19, 2021, with the first powered, controlled flight of an aircraft on another planet. How do engineers talk to a helicopter all the way out on Mars? How about other spacecraft? We’ll hear about it from Nacer Chahat of NASA’s Jet Propulsion Laboratory ...

What is a black hole? How do we study them when we can’t see them? Astrophysicist Jeremy Schnittman from NASA’s Goddard Space Flight Center joins NASA Chief Scientist Jim Green for a fascinating conversation about the latest black hole research.

Go behind the scenes at NASA with Chief Scientist Jim Green in the Gravity Assist podcast.

What does it take to drive a rover that’s more than 100 million miles away? Sophia Mitchell at NASA’s Jet Propulsion Laboratory has been driving the Mars Curiosity rover since 2018.

Why don’t we go live on Saturn’s moon Titan? What would it mean if we found life elsewhere? How did life get its start on Earth? NASA’s chief scientist Jim Green and astrobiologist Lindsay Hays discuss these and other audience questions from social media.

Between the orbits of Mars and Jupiter is a mysterious dwarf planet called Ceres. Its surface is dark and muddy, but has hundreds of patches of bright material.

NASA’s Europa Clipper mission will give us the most detailed look yet at Jupiter’s extraordinary moon Europa.

The Curiosity rover has been probing the secrets of Mars since its arrival in 2012. Its discoveries include chemical signatures that could be related to life – or, alternatively, to geological processes.

Astronomer and historian Steven Dick tells us there are many approaches to consider and many questions we should ask ourselves to get ready, in case extraterrestrial life is found.

While more research is needed, Smith and others are fascinated by the possibility that airborne microbes could also be found elsewhere in the solar system, and beyond.

With two microphones aboard the Perseverance rover, we can listen to Mars from its surface like never before. In addition to hearing how wind sounds on Mars, we can also listen to Perseverance driving on the surface, the Ingenuity helicopter flying nearby, and more.

A great era of exploration of the icy moons is about to begin. Athena Coustenis of the Paris Observatory talks about missions to the icy moons of the outer solar system and international collaborations with NASA and ESA.

If astrobiologists find life beyond Earth in the solar system, it will most likely be in the form of tiny organisms called microbes – nothing that would talk to us.

Vladimir Airapetian, scientist at NASA’s Goddard Space Flight Center, explains what researchers hope to find as they gaze beyond our solar system.

As the Perseverance Rover flies toward Jezero Crater on Mars, which once hosted water, astrobiologists are interested in places on Earth that are similar to the rover landing site.

Laurie Barge, an astrobiologist at NASA’s Jet Propulsion Laboratory, studies how plant-looking mineral structures called chimneys grow from chemicals found at the deepest depths of the ocean. In her lab she has glass vials and bulbs full of different chemical mixtures that simulate undersea conditions.

As we explore Mars and other places in the solar system that might have life, scientists who work in Planetary Protection are busy making sure that we don’t contaminate them.

Jason Wright, professor of astronomy and astrophysics at Penn State, has been thinking about the different technosignatures we could pick up using the telescopes we already have, and the telescopes that we could develop in the future.

Giada Arney, astrophysicist at NASA’s Goddard Space Flight Center, is looking at the potential for K stars to host habitable worlds. Learn about how stars affect planetary environments and why complex life on early Earth was impossible.

NASA astrophysicist Knicole Colon describes her work on the Kepler, Hubble, TESS and Webb missions, and takes us on a tour of some of her favorite planets.

We now know there are more planets than stars in the galaxy. Many of them are very different from ours. How would we know if any of them had life? Shawn Domagal-Goldman, astrobiologist at NASA’s Goddard Space Flight Center, discusses these strange and wondrous worlds beyond our Sun.

Astronauts on the International Space Station have been conducting experiments to grow food, including peppers and radishes. Christina Johnson, a NASA postdoc fellow at NASA's Kennedy Space Center in Florida, has been working on a variety of techniques to grow food in space. Learn what she thinks about the future of growing food beyond our planet.

From diving in Antarctica’s ice-covered lakes to exploring Mexico’s Cave of the Crystals, NASA astrobiologist Chris McKay has been searching for life in a wide variety of extreme environments on Earth.

Some of the most fascinating targets in the search for life in our solar system are moons of giant planets. Morgan Cable, an astrobiologist at NASA’s Jet Propulsion Laboratory, discusses these wondrous worlds, the exotic locations where she has done fieldwork, and the research she has done on the chemistry of life that could thrive on Titan.

When Earth was just a baby, meteors and asteroids rained down, delivering all sorts of chemicals to our developing planet. These small objects could have delivered the chemicals needed to spark life on Earth for the first time.

Imagine a future where the Perseverance Rover actually found definitive evidence of life on Mars. What would happen next? The Explore Mars Society recently held a virtual discussion on this topic with NASA’s chief scientist Jim Green and astrobiologist Penelope Boston from NASA’s Ames Research Center.