Join Donate

Video

The MarsDials and Bill Nye the Science Guy

Bill Nye tells how a simple shadowcaster intended for the Mars Exploration Rovers became an interplanetary campaign with the slogan, "Two Worlds, One Sun."

You are here:
Comments & Sharing
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