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Because the sun (Sol) has them all trapped in its gravitational field. All the planets revolve around the sun and so all the planet's satellites revolve around the sun, too.

There are quite a few more objects that are part of Sol's gravitational field- comets, asteroids etc.

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Q: Why do they say planets and their moons are parts of the solar system?
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Related questions

Which planet has the most number of moons in the solar system?

Out of the planets in our Solar System, Jupiter has the most moons. It has 63 confirmed moons.


Compare the sizes of the largest moons in the solar system and the smallest planets in the solar system?

Moons are larger, obviously.


How many planets in your solar system have no moons?

The answer is there are two planets which have no moons. Venus and Mercury


Do most planets have moons?

In our Solar System all planets have moons, except for Mercury and Venus.


Do all the planets of the solar system have moons?

Mercury and Venus do not have moons


How many planets are in your solar system that do not have moons?

Mercury and Venus do not have moons.


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Sun, moons, planets, asteroids, meteors, and STARS! (Our galaxy MILKY WAY)


What is the system within the solar system?

The "system" refers to the fact that there are several parts; in this case, the Sun itself, the planets, comets, moons, etc.


Name the two planets without moons?

In our solar system, Mercury and Venus are the two planets which do not have moons.


How many of the planets in your solar system have moons?

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169 moons.


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About 120 planets are in our solar system.