Moon

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Earth's Moon
Earth's Moon
"Moon" redirects here. For the Earth's Moon see The Moon

A natural satellite is simply called a moon. A moon is a large, usually ball-shaped object that goes around (orbits) a planet. The Earth has only one moon. Some other planets have many moons, and some have none. When people write just "the moon", they are usually talking about the moon of the Earth. Often Earth's moon is written with a capital letter, like Moon. The Latin word for the moon is Luna, which is why the word used to talk about the moon is "Lunar". For example, lunar eclipse.

Anything that goes around a planet is called a satellite. Moons are natural satellites. People also use rockets to send machines into orbit around the Earth. These machines are called artificial (man-made) satellites. They help us to communicate, the telephones and televisions need these satellites.

Main article see The Moon

Contents

[edit] Earth's Moon

Moons do not make their own light. We can see the Earth's moon because it acts like a mirror, and reflects the light of the Sun. The same half of the moon faces toward Earth at all times, no matter where it moves. But different parts of the moon are lit up by the Sun, so it looks different at different times of the month. This change as seen from Earth is called the phases of the moon, or lunar phases.

A moon's cycle is the time the moon takes to change from looking very bright and round to looking very small and thin, and then back to bright and round again. In the case of the Earth's moon, this is about four weeks. It does this about 13 times in one year. The moon's cycle is about 28 days, a bit shorter than a calendar month.

The Apollo 11 mission helped Neil Armstrong and Buzz Aldrin become the first people to walk on the Moon. They did this in July 20, 1969.

[edit] Orbits

The orbit of a moon or other satellite is affected by two forces: gravity, and the centripetal force. For example, the Earth's moon is kept in orbit by the gravitational pull from the Earth. This is also the way the Earth is attracted to the Sun, and stays in its orbit. The orbit of the Earth's moon actually causes the tides and waves on Earth.

Selected moons, with the Earth to scale. Nineteen moons are large enough to be round, and one, Titan, has a substantial atmosphere.
Selected moons, with the Earth to scale. Nineteen moons are large enough to be round, and one, Titan, has a substantial atmosphere.

[edit] Moons of moons

Artist impression of Rhea's rings
Artist impression of Rhea's rings

No moons that belong to moons have been found. In most cases, the tidal effects of the main body would make such as unstable.

However, math completed after the recent finding <ref>{{

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}}</ref> something that is known with shepherd moons.

[edit] Asteroid moons

The finding of 243 Ida's moon Dactyl in the early 1990s was the proof that some asteroids have moons; indeed, 87 Sylvia has two. Some, such as 90 Antiope, are double asteroids with two same-sized parts.

[edit] Moons of the Solar System

The biggest moons in the Solar System (those bigger than about 3000 km across) are Earth's moon, Jupiter's Galilean moons (Io, Europa, Ganymede, and Callisto), Saturn's moon Titan, and Neptune's captured moon Triton.

The following is a table grouping the moons of the solar system by diameter. The column on the right has some notable planets, dwarf planets, asteroids, and Trans-Neptunian Objects for comparing. It is normal for moons to be named after people from mythology.

Template:Natural satellites

[edit] Planets that have moons

Planets in our Solar System that have moon(s):

[edit] Dwarf planets that have moons

[edit] Planets that do not have moons

Planets in our Solar System that do not have moons:

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License and Copyright Statement: All text is available under the terms of the GNU Free Documentation License (see Copyrights for details).

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