Explore Worlds
Find Life
Defend Earth
Planetary Video • Random Space Fact
How Big Telescopes Work
Bruce is at Mt. Wilson to explain how big telescopes, like the 100-inch, can look deep into space.
Starring Dr. Bruce Betts • Music by Jim McKeever
What We Do
How We Work
Our Results
Get Involved
Support Our Mission
The Planetary Fund
Accelerate progress in our three core enterprises — Explore Worlds, Find Life, and Defend Earth. You can support the entire fund, or designate a core enterprise of your choice.
Give Today
About Us
The Planetary Society
Our Vision
Know the cosmos and our place within it.
Our Mission
Empowering the world's citizens to advance space science and exploration.