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9 Cards in this Set
- Front
- Back
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spectrescope |
a tool that spread slight into different wavelengths |
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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 wavelength |
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Big Bang Theory: |
the universe began from one point billions of years ago and has beenexpanding ever since |
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Doppler Shift: |
the shift to a different wavelength |
