constellation - A group of stars that forms a particular shape in the sky and has been given a name., moon phases - How the moon appears from Earth., orbit - The path a revolving object follows., Earth's center - The exact middle of our planet, or the direction "down" for objects on earth., night - The half of Earth facing away from the sun and in shadow., Earth's rotation - Every 24 hours, Earth completes one rotation on its axis. , rotate - To spin around., axis - An imaginary line that runs through the North and South Poles from which the Earth spins., sun - Our closest star; appears brighter and larger than all other stars because it is our closest star., day - The half of Earth facing the sun illuminated by the sun's light., gravitational force - A force that pulls objects towards each other., revolution - The MOTION of one object around another., star - A ball of hot gases that give off light and other types of energy., apparent brightness - How bright a star appears., matter - Anything that has mass and takes up space., gravity - A force that pulls objects towards each other; Earth's gravity pulls objects "down" toward the center of Earth., mass - The amount of matter in a substance., revolve - To travel around another object in space.,

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