Join Donate

Geoff Marcy

Use when no other thumbnail exists

Geoff Marcy

Latest Planetary Radio Appearance

Planetary Radio 5th Anniversary Show: Astronomer Geoff Marcy on Discovery of Fifth Planet in Star System

November 26, 2007 • 0:28:52

We celebrate our 5th anniversary by learning about discovery of a five-planet star system, the largest found so far. Q&A on Jupiter's red spot.

astronaut on Phobos
Let's Change the World

Become a member of The Planetary Society and together we will create the future of space exploration.

Join Today

Mars
Advocacy

Our Advocacy Program provides each Society member a voice in the process. Funding is crucial.

Donate

You are here: