one complete rotation of the Earth in a 24 hour period

one complete revolution of the Earth around the sun in 365.25

the force that keeps planets from crashing into the sun

the force that holds the Earth in orbit around the sun

the natural satellite that orbits the Earth

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

getting bigger (as in the lit part of the moon we see from Earth)

getting smaller (as in the lit part of the moon we see from Earth)

moon is almost all the way lit (appears to have a hump)

only a small piece of the moon appears lit

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