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Moon

The Earth's only natural satellite. The moon has a cold, dry orb covered with many lunar craters and strewn with rocks and dust. The moon has no atmosphere. But recent lunar missions have found plenty frozen water on the moon.

Industry: Astronomy

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Moon

Apogee
Astronomy; Moon

The point in the Moon's orbit when it is farthest from the Earth (opposite of perigee).

Apogean
Astronomy; Moon

Tide The low tide of the month that occurs when the Moon is at tide apogee (farthest from Earth).

Apolune
Astronomy; Moon

The point in the orbit of an object around the Moon (such as a spacecraft) when it is farthest from the Moons surface.

Moon set
Astronomy; Moon

The point in time when the upper limb of the Moon is even with the Earth's horizon as the Moon rises in the east.

Near side
Astronomy; Moon

The side of the Moon that is visible from the Earth.

Nadir
Astronomy; Moon

An imaginary point directly under an observer on the surface of the Earth, extending through the Earth and into the sky.

Nodes
Astronomy; Moon

The imaginary points at which the orbital path of the Moon or other celestial body crosses the ecliptic.

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