The path one object takes as it revolves around another object in space

a natural satellite that orbits a planet

The shape of the illuminated (lit up) part of the Moon as seen by an observer

An area of darkness caused by blocking light

An imaginary line that the Earth rotates around

The spinning of the Earth on its axis (24 hours)

the time it takes the Earth to make one complete trip around the sun (365 ΒΌ days)

The layer of gas surrounding planet Earth

large, bowl-shaped pits on the surface of a moon or planet

One complete rotation of the earth in a 24 hour period

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