Stars - these objects produce and give off their own heat and light, solar system - it is made up of the sun and its family of nine planets, mercury - this planet is closest to the sun, sun - this is the center of the solar system and planets revolve around it, moon - this body travels around earth. It is known as earth's satellite, saturn - this is the 6th planet from the sun known for the beautiful system of rings that circle the planet, constellations - these are patterns of stars in the sky that seem to be in the shapes of pictures, 24 Hours - this is how long it takes the moon to circle the earth, 365 days - thi sis how long it takes the earth to circle the sun, astronomy - this is another name for the study of space, hubble's law - The theory that galaxies are moving away from each other at speeds of thousands of miles per second, geocentric model - this model was created by Ptolemy that states the earth is the center of the solar system, heliocentric model - this theory was introduced by copernicus and proven by galileo. It states that the sun is the center of the solar system, gravity - the force by which a planet or other body draws objects toward its center., inertia - The tendency of a moving object to continue in a straight line or a stationary object to remain in place,

Astronomy Terms

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