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Natural satellite
A natural satellite or moon is a celestial body that orbits a planet or smaller body, which is called its primary. The two terms are used synonymously for non-artificial satellites of planets, of dwarf planets, and of minor planets....
Timeline of Events
1610
1.13.1610
Galileo Galilei discovers Ganymede, 4th moon of Jupiter.
1877
8.12.1877
Asaph Hall discovers the Mars moon Deimos.
2004
6.11.2004
Cassini-Huygens makes its closest flyby of the Saturn moon Phoebe.