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unit 1 astro. vocab
mr. arnhold
Term | Definition |
---|---|
astronomy | the scientific study of celestial objects beyond earths atmosphere |
meteoroid | rocky and metallic objects in space range in size from dust grains to small asteroids |
asteroid | rocky and metallic object in space, larger version of a meteoroid, located within the asteroid belt between mars and jupiter |
comet | small body of ice, rock and dust |
galaxy | a large collection of hundreds of billions of stars in space, held together by shared gravity |
universe | the sum total of all matter and energy |
nebula | a cloud of interstellar gases |
front line | the particular distance in the solar nebula from the center where its cold enough for compounds |
exoplanet | planet outside of our solar system orbiting another star |
fusion | the compression and heat of the material in the center of the nebula becomes so hot that atoms began to "fuse" together |