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range of different colors with different wavelengths that you can see if you shine white light through a prism
radio waves, infrared radiation, visible light, ultraviolet radiation, x-rays, gamma rays
a system where one star periodically blocks the light from another, dim star revolves around bright star
huge group of single stars, star sytems, star clusters, dust, and gas bound together by gravity
look like circles, old stars, contain billions of stars, little gas and dust between stars
big bang theory
theory that the universe formed in an instant, billions of years ago, in an enormous explosion
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