Help Shape the Future of Space Exploration

Join The Planetary Society Now  arrow.png

Join our eNewsletter for updates & action alerts

    Please leave this field empty

How Many Moons?

A whirlwind of "new moon" discoveries have kept teachers, textbooks, and web sites scrambling to keep up. In an effort to set the record straight, listed below are the number of known moons in our solar system as of March, 2009.

PlanetNumber of Moons
Mercury 0
Venus 0
Earth 1
Mars 2
Jupiter 63
Saturn 61
Uranus 27
Neptune 13
Pluto 3
Facebook Twitter Email RSS AddThis

Planetary Defense

An asteroid or comet headed for Earth is the only large-scale natural disaster we can prevent. Working together to fund our Shoemaker NEO Grants for astronomers, we can help save the world.



Beyond The Horizon, There's More To Explore!

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

Join Us

Space in Images

Pretty pictures and
awe-inspiring science.

See More

Join The Planetary Society

Let’s explore the cosmos together!

Become a Member

Connect With Us

Facebook, Twitter, YouTube and more…
Continue the conversation with our online community!