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Inner and outer planets

Monday, April 13th, 2009

Earth is percieved as a rocky planet, what are other planets like? Did you know Mars is cold and that outer planets are really gigantic gas envelopes? What about a liquid planet? Could such a planet exist? And what really defines a planet, anyway? Explore these questions and more on this week's "SkyTalk."

Credit: NASA and The Hubble Heritage Team (STScl/AURA)

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Dr. Derrick H. Pitts

Senior Scientist, Chief Astronomer, Franklin Institute Science Museum

Sky Talk is a weekly discussion of what's new and interesting in astronomy with Dr. Derrick Pitts and WHYY FM's Dave Heller every Monday evening during NewsWorks Tonight at 6 pm. Learn more about Dr. Derrick Pitts »

Extended Interview

Derrick Pitts speaks with NASA Technical Manager Rob Landis about what it's like behind the scenes and what's next for the Space Program.

Atlantis Launch Extra

Derrick Pitts takes a closer look at the stainless-steel star made of the original Franklin Institute Fels Planetarium dome, which hitched a ride with the last space shuttle mission.

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Astronomy Clubs

Check out these local area astronomy clubs for a star party near you: