The nature of light and the size of the Universe.
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If we put a mirror millions of light years away and reflected earth, could we see what earth looked like millions of years ago?
Started by thedocBoard Physics, Astronomy & Cosmology |
Replies: 9 Views: 28930 |
20/05/2018 00:53:37 by raf21 |
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How do we know the Universe is expanding, and expanding into nothing?
Started by guest39538Board Physics, Astronomy & Cosmology |
Replies: 43 Views: 49631 |
22/07/2020 05:10:15 by CPT ArkAngel |
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If the universe is expanding, what is it expanding into?
Started by Tornado220Board Physics, Astronomy & Cosmology |
Replies: 14 Views: 18551 |
06/07/2017 10:35:51 by paulggriffiths |
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What is "light" pressure?
Started by sorincosofretBoard Physics, Astronomy & Cosmology |
Replies: 34 Views: 53807 |
13/02/2018 19:46:54 by Bill S |
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What is a halogen light bulb? What halogen is used and why is this better?
Started by chrisBoard Technology |
Replies: 4 Views: 24007 |
02/02/2010 11:17:45 by Mazurka |