| Advantages of Space |
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| • | Different phenomena produce different wavelength
light |
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| – | Ordinary stars:
Mostly Visible light |
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| – | Cool planets or dust clouds: Infrared light |
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| – | Moving charged particles, cool molecules: Radio/millimeter waves |
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| – | Very hot objects:
X-Rays and Gamma Rays |
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| – | Quasars: ALL wavelengths |
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