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| a vast open space which contains all of the matter and energy in existence.[image] |
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| a cloud of gas and dust in space.[image] |
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| small, hot, dim star that is the leftover center of an old star after it runs out of fuel.[image] |
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| a tiny star that remains after a supernova explosion[image] |
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| a galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms.[image] |
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| a celestial body moving in an elliptical orbit around a star.[image] |
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| chunks of rock or dust floating in space[image] |
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| a fixed luminous point in the night sky that is a large, remote incandescent body like the sun.[image] |
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| a normal star that is undergoing nuclear fusion of hydrogen into helium.[image] |
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| an astronomical event that occurs during the last stages of a massive star's life[image] |
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| a rapidly spinning neutron star that emits pulses of radio and optical energy[image] |
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| a galaxy shaped like a round or flattened ball, generally containing only old stars[image] |
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| rocky metallic objects that orbit the sun but are too small to be considered planets[image] |
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| a celestial body resembling a small planet but lacking certain technical criteria that is required to be considered such[image] |
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| a huge collection of gas, dust, and billions of stars and their solar systems[image] |
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| a luminous giants star of low immediate mass in a late phase of stellar evolution[image] |
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| a region of space having a gravitational field so intense that no matter or radiation can escape.[image] |
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| a massive and extremely remote celestial object that emits exceptiona[image]lly large amounts of energy |
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| a galaxy that does not have a distinct regular shape, unlike an elliptical ga[image]laxy |
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| large clumps of ice, dust and frozen gases that travel around the Sun in long elliptical orbits[image] |
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| the natural satellite of the earth, visible (chiefly at night) by reflected light from the sun.[image] |
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