Comment on That explains a lot

• psud@aussie.zone ⁨2⁩ ⁨months⁩ ago

  And Jupiter would have an event horizon 2.8m across and last about 10^67 years (still not forever)

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  • AdrianTheFrog@lemmy.world ⁨2⁩ ⁨months⁩ ago

    Does the energy of light entering the black hole make it last longer?

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    • psud@aussie.zone ⁨2⁩ ⁨months⁩ ago

      I’m not an astrophysicist, but since general relativity says matter and energy are related and light can’t escape if it crosses the event horizon it would add to the black hole

      But a 3m sphere at Jupiter’s distance from the sun wouldn’t catch much mass equivalent light from the sun

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      • AdrianTheFrog@lemmy.world ⁨2⁩ ⁨months⁩ ago

        Yeah, but it does have 10^67 years to catch it.

        Assuming the light isn’t bending at all, I think it should get about 890 watts of light, or 2.810^10 joules per year (or 3.110^-7 kg per year?) from the sun, which should be enough to cause it to grow, at least while the sun is still around. I expect it would get a lot more mass from gasses, meteors, and dust in that time frame. Based on your numbers above I think it should only be losing like 2^-40 kg per year if it was losing mass at a constant rate.

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