6. How many satellites does each planet have?
Our planet Earth has the one familiar satellite known simply as "the moon". The only other inner planet with natural satellites is the planet Mars, which has two, named Phobos and Deimos.
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The outer planets have substantially more natural satellites than the inner planets. Jupiter has sixteen at last count, although not all are thought to have originally formed at the same time as Jupiter.
Saturn is presently known to have eighteen natural satellites, with the possibility of several others which have yet to be confirmed.
Uranus is known to have at least fifteen natural satellites while Neptune has at least eight natural satellites, including the most famous named Triton.
Pluto has only a single companion named Charon, which is half Pluto's size.
| Mercury | 0 |
| Venus | 0 |
| Earth | 1 |
| Mars | 2 |
| Jupiter | 16 |
| Saturn | 18 |
| Uranus | 15+ |
| Neptune | 8+ |
| Pluto | 1 |