In this episode of Gravity Assist, Jim Green talks with New Horizons Principal Investigator Alan Stern of the Southwest Research Institute about what the July 2015 flyby of Pluto revealed about this mysterious and diverse world.

n this episode of Gravity Assist, NASA’s Jim Green and Amy Simon discuss Uranus, Neptune, and Neptune’s intriguing moon – Triton -- and what we still have to learn about these mysterious bodies.

n this episode of Gravity Assist, NASA’s Jim Green and Amy Simon discuss Uranus, Neptune, and Neptune’s intriguing moon – Triton -- and what we still have to learn about these mysterious bodies.

With me today is Dr. Linda Spilker from NASA's Jet Propulsion Laboratory. She's the project scientist for our Cassini Mission, which as everyone knows, had a recent spectacular finale at Saturn.

As large as 1,000 Earths, Jupiter is the heavy hitter of the solar system. Even its Great Red Spot is larger than Earth, yet it’s shrinking! In this episode of Gravity Assist, Planetary Science Director Jim Green talks with Jared Espley of NASA’s Juno mission.

With Jim Green today is the “man about Mars,” Bruce Jakosky from the University of Colorado. Bruce is the principal investigator of NASA's MAVEN mission. Joining them is Michael Meyer the lead Mars scientist at NASA Headquarters.

Jim Green is joined by lunar expert Sarah Noble to discuss how the Moon was formed, lava tubes and moonquakes, the “dark side of the Moon,” and mysteries we have yet to solve about Earth’s nearest neighbor.

NASA not only seeks to unravel the secrets of the solar system and the universe, we have a robust program to better understand how Earth works as a system, how it’s changing, and to assist when natural disasters like hurricanes and earthquakes occur.

NASA not only seeks to unravel the secrets of the solar system and the universe, we have a robust program to better understand how Earth works as a system, how it’s changing, and to assist when natural disasters like hurricanes and earthquakes occur.

The next stop on our virtual tour is Venus, the closest planet to Earth and the hottest planet in our solar system, with surface temperatures scorching enough to melt lead.