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| A referent that can be used to locate objects in the sky |
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| an averaged star, considering mass and age |
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| the brightness of a star at a defined standard distance |
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| the total amount of energy radiated from the surface of a star into space each second |
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| colors of starlight is from the hottest star |
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| the color of a star is related to |
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| The temperature-luminosity graph used to classify stars |
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| the period-brightness relationship of a Cepheid variable star allows astronomers to measure |
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| where does our Sun belong based on the HR classification of stars |
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| the lifetime of star depends on |
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| protostar, main sequence, red giant and white dwarf |
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| the process of a less massive star growing old, its outer layer is sometimes blown off into space, forming a |
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| collapse of a massive star |
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| results in a tremendous explosion called a supernova |
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| a rapidly rotating neutron star with a strong magnetic field |
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| the product of the collapse of a massive star with a core three times the mass of our Sun |
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| the basic unit of the universe |
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| a galaxy is held together by |
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| the diameter of the Milky Way |
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| stars appear as point sources of light, and planets are disk sources |
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| stars twinkle and planers do not twinkle because |
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| how much of the celestial meridian can you see from any given point on the surface of Earth |
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| coordinate system of lines depends on where you are on the surface of Earth |
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| the angle that you see Polaris, the North Star, above the horizon is about the same as your approximate location |
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| if you were at the north celestial pole looking down on earth how would it appear moving |
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| part of a newborn star where nuclear fusion takes place |
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| the brightest stars listed |
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| elements that are more massive than the element iron were formed |
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| when the core remaining after a supernova has a mass between 1.5 and 3 solar masses it collapse to a |
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| distance in outer space is measured in terms of |
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| the interior of a an average star except |
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| stars that are faint, very dense, white hot, and close to the end of their lifetime |
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| elements forms in a supernova explosion of a dying star |
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| the greater the distance to a galaxy, the great a redshift in its spectral lines |
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| the obstacle to finding extraterrestrial life |
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| redshift calculations by Hubble |
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| intital evidence that supports the big bang theory of the creation of the universe |
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