Recent content by DPH
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High School Experience Travel on a Photon: Hitch-Hiker's Guide to the Universe
We can see back in space just short of 13.8 billion years when the Big Bang begin. At the 13.8 limit space is expanding at the speed of light and creates an effective edge to what we can know. If we do the calculations that edge is now out 46 billion light years since it immitted light at the...- DPH
- Post #6
- Forum: Special and General Relativity
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Undergrad How Long Does it Take to Fall into a Black Hole?
A related problem I have thought about, a 1kg mass increases the event horizon of a 10 solar mass black hole by 1.5e-27 m. It takes only a finite and relatively short observer time for a falling mass to reach this distance where it would be absorbed. Question, as the 1kg mass approaches the BH...- DPH
- Post #37
- Forum: Special and General Relativity