Explore Worlds
Find Life
Defend Earth
Planetary Video • Events
Q&A with "We Are Not Alone" author Marc Hartzman
Mat Kaplan and writer/historian Marc Hartzman discuss Marc's book "We Are Not Alone" in this Book Club Q&A.
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.