Planetary Society logo
  • “Exploration is in our nature.” - Carl Sagan

Join the Day of Action

Connect directly with Congress to advocate for space on March 31. We provide the training, you provide the passion.

Take Action

Featured Stories

The Downlink

Cosmic Streaks, Smudges, and Fuzz

Planetary Radio

Spinoffs: How NASA Technologies Benefit Life on Earth

Planetfest '21

Revisit the Fun of Planetfest '21 on Demand

Be A Space Advocate!

Act now to help keep our space program going strong. Make your voice heard and tell our newly elected officials to make space a priority.

Donate Today

The LightSail 2 Mission

LightSail Updates

LightSail 2 Enters Extended Mission Phase

LightSail Home

The LightSail Mission

Donate

Support the Mission

Carl Sagan co-founded The Planetary Society to give you a role in space exploration.

Join CEO Bill Nye and the world’s largest and most effective space advocacy movement.

Become a member

Please accept marketing-cookies to watch this video.

Sharing and growing the passion, beauty, and joy of space exploration.

lightbulb

Educate

We expand public knowledge about space.

Learn More
megaphone

Advocate

We shape space policy and fight for future exploration.

Learn More
rocket

Innovate

We invest in innovative space science and technology.

Learn More
hands holding earth

Collaborate

We cultivate a worldwide movement for space.

Learn More
people at launch event

"We're changing the world. Are you in?"
- CEO Bill Nye

Sign up for email updates