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Space and Universe 1
Space and Universe part 1 vocab.
Term | Definition |
---|---|
Big Bang Theory | states that the Universe was in a very high density state and then expands |
Geocentric Theory | in the Middle Ages, the earth-centered view of the universe in which scholars believed that the earth was an immovable object located at the center of the universe |
Heliocentric Theory | the idea that the earth and the other planets revolve around the sun |
galaxy | A collection of stars, dust, and gas bound together by gravity |
Milky Way Galaxy | Galaxy that contains our Solar System. The name derives from its appearance as a dim "milky" glowing band arching across the night sky, in which the naked eye cannot distinguish individual stars. |
Gravity | A force that pulls objects toward each other |
universe | All of space and everything in it |
Planets | a celestial body moving in an elliptical orbit around a star. |
meteor | A streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere. |
Asteroids | rocky metallic objects that orbit the sun but are too small to be considered planets |
comet | A ball of frozen dust and rock that orbits the sun and has a tail that glows |