How Many Moons?

A lot of moons or no moons at all?

We on Earth have just one moon, but some planets have dozens of them. Others don’t have any. Which planets have moons, and which don’t?

Let’s go in order from the Sun.


Mercury and Venus

Up first are Mercury and Venus. Neither of them has a moon.

Because Mercury is so close to the Sun and its gravity, it wouldn’t be able to hold on to its own moon. Any moon would most likely crash into Mercury or maybe go into orbit around the Sun and eventually get pulled into it.

Why Venus doesn’t have a moon is a mystery for scientists to solve.

Mercury and Venus do not have any moons. Cartoon of Mercury telling the sun it's the sun's fault. Because of you, I don't have any moons. Sorry about that.

Earth (That's us!)

Up next is Earth, and of course we have one moon.

Earth and the moon are glad they're buds. I'm so glad we're buds.

Mars

Mars has two moons. Their names are Phobos and Deimos. Don’t you wish our moon had a cool name like that?

Cartoon of Mars and its two moons, Phobos and Deimos.

Jupiter

Next are the giant outer planets. They have lots of moons. Jupiter, for instance, has 79 known moons!

The most well-known of Jupiter's moons are Io (pronounced eye-oh), Europa, and Callisto. Jupiter also has the biggest moon in our solar system, Ganymede.

These moons are so big you can see them with just a pair of binoculars.

Jupiter is the biggest planet and has the biggest moon, Ganymede. Cartoon illustration.

Saturn

Saturn has 53 moons that have been named. Saturn also has nine moons awaiting confirmation. They’re unconfirmed because we’re waiting to get more information about them. If all of these moons get confirmed, Saturn will have 62 moons. And that’s not counting Saturn’s beautiful rings.

Saturn’s moons have great names like Mimas, Enceladus, and Tethys. One of these moons, named Titan, even has its own atmosphere, which is very unusual for a moon.

Cartoon of Saturn with a 'most moons' ribbon.

Uranus and Neptune

Uranus has 27 moons that we know of. Some of them are half made of ice.

Lastly, Neptune has 13 named moons and one moon awaiting confirmation. One of Neptune's moons, Triton, is as big as dwarf planet Pluto.

Neptune asks Uranus if theyhave enough moons. We've got a good number of moons, right?

To learn more about the moons in our solar system, visit the NASA Solar System Exploration moons page.

article last updated August 7, 2018
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