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The universe is 13.8b years old, yet we've seen a galaxy 13.4b light years away?
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How do we know the Universe is expanding, and expanding into nothing?
Started by guest39538Board Physics, Astronomy & Cosmology |
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If the universe is expanding, what is it expanding into?
Started by Tornado220Board Physics, Astronomy & Cosmology |
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What is "light" pressure?
Started by sorincosofretBoard Physics, Astronomy & Cosmology |
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What is a halogen light bulb? What halogen is used and why is this better?
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Is solar energy the same as light energy?
Started by FeliciaBoard Technology |
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