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9 Cards in this Set
- Front
- Back
spectroscope |
a tool that spreads light into different wavelengths |
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astromical 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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appearent magnatude |
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 |