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18 Cards in this Set
- Front
- Back
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sun |
closest star to earth, medium sized star |
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composition of star |
told by its display of color |
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hydrogen |
most common element of star |
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color blue |
hot - 35k to 50k |
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color yellow |
medium |
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red color |
cool |
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stars shift |
westward each night |
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circumpolar |
some stars are always seen in sky, stars that circle the north star |
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3 motions of stars |
rotate on axis revolve around another star (binary) move towards or away from the earth |
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Doppler effect |
blue shift- moving towards red shift- moving away |
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light years |
distance light travels in one year sun is 8 light minutes from earth |
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closest star other than the sun? |
proxima centauri |
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sirius |
brightest star |
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parallax |
measure stars from different angles as earth revolves |
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apparent magnitude |
how bright a star appears from earth |
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brightest stars have |
lowest numbers |
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dimmest stars have |
highest numbers- positive |
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absolute magnitude |
actual brightness no matter appearance |
