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| Classification system based on how bright a star appears to be; doesn't take distance into account so cannot indicate how bright a star actually is. |
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| Describes two stars that are bound together by gravity and orbit a common center of mass. |
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| group of stars that forms a pattern in the sky that resembles an animal, mythological character, or everyday object. |
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| Hertzsprung-Russel diagram |
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| Graph that relates stellar characterists-class, mass, temperature, magnitude, diamter, and luminiosity. |
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| energy output from the surface of a star per second; measured in watts. |
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| energy output from the surface of a star per second; measured in watts. |
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| In an H-R diagram, the broad, diagonal band that includes about 90 percent of all stars and runs from hot, luminous stars in the upper-left corner to cool, dim stars in the lower-right corner. |
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| apparent positional shift of an object caused by the motion of the observer. |
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| Small, extremely dense remnant of a star whose gravity is so immense that not even light can escape its gravity field. |
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| Large cloud of intersellar gas and dust that collapses on itself, due to its own gravity, and forms a hot, condensed object that will become a new star. |
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| collapsed, dense core of a star that forms quickly while its outer layers are falling inward, has a radius of about 10 km, a mass 1.5 to 3 times that of the Sun, and contains only neutrons. |
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| Hot, condsensed object at the center of a nebula that will become a new star when nuclear fusion reactions begin. |
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| Massive explosion that occurs when the outer layers of a star are blown off. |
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