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Earth's Place in the Universe

Author: solar system
Across
The force that pulls all objects toward each other
A space object with a regular orbit around a planet
A star and the planets that orbit around it (2 words)
The only star in our solar system
Energy transfer through empty space
Mass/volume
Down
Length of time it takes to complete one rotation
The name of our galaxy(2 words)
The act of spinning around an axis
The act of orbiting around another abject
The amount of matter in an object
Length of time it takes to make one orbit around a star