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9 Cards in this Set
- Front
- Back
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spectroscope- |
a tool that spreads light into a different wave lenght |
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Astronomical unit- |
the average distance between earth and the sun, about 150 million km |
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light year- |
the distance that light travels in one year,300,000 km/s |
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apparent magnitude - |
a measure of how bright an object appears from earth |
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luminosity- |
the true brightness of an object |
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galaxy- |
a huge collection of stars |
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Dark matter- |
matter that emits no light at any wave lenght |
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Big Bang Theory |
the universe began from one point billions of years ago and has been expanding ever since |
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Doppler shift- |
the shift to a different wavelength |
