Comment on That explains a lot

• psud@aussie.zone ⁨1⁩ ⁨day⁩ 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 ⁨1⁩ ⁨day⁩ 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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    • psud@aussie.zone ⁨1⁩ ⁨day⁩ ago

      The radius collecting will be pirr, r=2.8/2

      3.14 * 1.4^2 (using a calc for precision) = 6.1m^2

      34 to 41 W/m^2 = 207 to 250W

      How did you get 800W? Diameter instead of radius?

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      • AdrianTheFrog@lemmy.world ⁨15⁩ ⁨hours⁩ ago

        Oh probably

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