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→Trivia: Other planets have moons, too.
== Trivia==
== Trivia==
Although the Moon is often described as revolving around the Earth, this is slightly inaccurate: the Earth and the Moon ''both'' revolve around their ''barycenter'', their common [[centroid|center of mass]]. This point is 1,700 below the earth's surface, which is about 1/4 of the earth's [[radius]].<ref> The radius of the Earth is 6,378 kilometers, so that means that the barycenter is located INSIDE the Earth about 1707 kilometers below its surface. [http://www.astronomycafe.net/qadir/q665.html] </ref>
Although the Moon is often described as revolving around the Earth, this is slightly inaccurate: the Earth and the Moon ''both'' revolve around their ''barycenter'', their common [[centroid|center of mass]]. This point is 1,700 below the earth's surface, which is about 1/4 of the earth's [[radius]].<ref> The radius of the Earth is 6,378 kilometers, so that means that the barycenter is located INSIDE the Earth about 1707 kilometers below its surface. [http://www.astronomycafe.net/qadir/q665.html] </ref>
When speaking of things having to do with the moon, the adjective ''lunar'' is used. The Greek-derived prefixed root ''selen-'' followed by the morpheme ''-o-'' is used as well; for example, the [[science]] of mapping the moon is called ''[[selenography]]'' (morphemes: ''selen-o-graph-y''). (Note, however, that the apsides of the orbits of the [[Project Apollo]] spacecraft were always called ''pericynthion'' and ''apocynthion'', not "periselene" and "aposelene.")
When speaking of things having to do with the moon, the adjective ''lunar'' is used. The Greek-derived prefixed root ''selen-'' followed by the morpheme ''-o-'' is used as well; for example, the [[science]] of mapping the moon is called ''[[selenography]]'' (morphemes: ''selen-o-graph-y''). (Note, however, that the apsides of the orbits of the [[Project Apollo]] spacecraft were always called ''pericynthion'' and ''apocynthion'', not "periselene" and "aposelene.")
== Other moons ==
[[Image:Many_moons.jpg|300px|left]]
While the Moon of [[Earth]] is the best-known satellite of any [[planet]], other planets in our solar system also have moons. Earth has the least number of moons (one), while [[Jupiter]] has sixty-two. The first extraterrestrial moons to be discovered were the four Galilean moons ([[Io]], [[Europa]], [[Ganymede]], and [[Callisto]]. Next to these, Earth's Moon is one of the largest, but Jupiter and [[Saturn]] have moons in orbit about them that might qualify as planets if they orbited the [[Sun]] instead.
== See also ==
== See also ==