Sci. 3-2 Moons Pages 75-82

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Sci. 3-2 Moons Pages 75-82
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A. Satellites are natural or artificial bodies
that revolve around larger bodies like planets.
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B. Except for Mercury and Venus, all planets
have natural satellites called moons.
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C. Earths moon is also known as Luna.
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D. The composition of the moon is similar to
Earths mantle.
1) It is thought that a large object hit the
earth while it was forming. Since Earth was
still molten, a part of Earths mantle was
blasted into orbit around Earth to form the moon.
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E. The moons phases are caused by the moons
orbit around the Earth. At different times of
the month, we view different amounts of sunlight
on the moon because of the moons position
relative to the sun and the Earth.
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F. Eclipse- when the shadow of one celestial
body fall on another
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1) Lunar Eclipse occurs when the earths shadow
falls on the moon.
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2) Solar Eclipse occurs when the moon is between
the sun and the Earth, causing the moons shadow
to fall on the Earth.
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G. The plane of the moons orbit around the
earth is tilted by 5 degrees relative to the
plane of the Earths orbit around the sun. This
is why we do not get an eclipse every month.
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H. Moons of other Planets
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1) Mars- 2 moons called Phobos and Deimos
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2) Jupiter- 28 known moons. 4 largest-
Ganymede, Callisto, Io, Europa
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3) Saturn- 30 known moons. Titan is one moon
with a thick hazy orange atmosphere.
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4) Uranus-21 moons. 3 moons were just discovered
in 1999, Miranda broke apart and reformed.
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5) Neptune- 8 moons, Triton revolves around the
planet in a backward orbit.
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6) Pluto- 1 moon- Charon
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1. Mercury- no moons
2. Venus- no moons