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Old 10-12-2019, 01:53 PM
 
25,873 posts, read 32,430,699 times
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This morning while cleaning cupboards in the kitchen I began to wonder whether black holes are exothermic or endothermic. At first I thought it would be exothermic, gives off heat, the more I thought about it, all that matter once inside would stop movement. Then the thought, would there be a heat signature? Would there be an absence of a heat signature.

After a quick search, I found this:

https://www.sciencefocus.com/space/a...s-hot-or-cold/

Here is a far better link:

https://phys.org/news/2016-09-cold-black-holes.html

It is barely warmer than absolute zero.

Now I know. Or at least have a better idea.
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Old 10-16-2019, 11:27 AM
 
Location: Seattle
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I was wondering about the accretion disk in the frame dragging region. Since relativity applies, time should appear to slow down, photon wavelengths will stretch, and the region will appear cooler than the surroundings. Does that act endothermic?
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Old 10-20-2019, 04:31 AM
 
Location: Martinsburg, West Virginia
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Since black holes emit Hawking Radiation and are slowly evaporating, I would think black holes are exothermic.
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Old 10-21-2019, 10:31 PM
 
25,873 posts, read 32,430,699 times
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Quote:
Originally Posted by rjshae View Post
I was wondering about the accretion disk in the frame dragging region. Since relativity applies, time should appear to slow down, photon wavelengths will stretch, and the region will appear cooler than the surroundings. Does that act endothermic?
In that part, I would agree.
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