Moon

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.

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Moon

basalt

Astronomy; Moon

Volcanic rock formed by rapidly cooling lava found on the luna surface in low areas.

breccia

Astronomy; Moon

A composite rock found on the moon and formed from small pieces of different materials, minerals and fragments of other rocks. Breccia is also found on the earth.

celestial equator

Astronomy; Moon

An imaginary projection of the Earth's equator into the sky. The celestial equator is 90 degrees from each of Earth's celestial poles.

celestial mechanics

Astronomy; Moon

The branch of astronomy that describes the motions and gravitational effects of celestial objects.

colongitude

Astronomy; Moon

Also called selenographic colongitude, it is the longitude on the surface of the Moon marked by the edge of the area illuminated by the Sun.

conjunction

Astronomy; Moon

The position of two celestial bodies when they are in line with one another as seen from the perspective of an Earth-bound observer. The new moon is also referred to as moon in conjunction with the ...