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Scale of the Universe

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249 points Leftium | 2 comments | 19 Apr 24 03:53 UTC | HN request time: 0.004s | source
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blowski ◴[19 Apr 24 10:54 UTC] No.40085247[source]▶
TIL - All humans stood on top of each other would be significantly taller than the diameter of the Sun.
replies(1): >>40085582 #
prmph ◴[19 Apr 24 11:44 UTC] No.40085582[source]▶
Cool.

And yet all humans alive, if packed like sardines, will fit in a 1 mile cube, with room to spare.

Physical dimensions can be an amazing un-intuitive thing.

replies(3): >>40085712 #>>40085723 #>>40086735 #
ninkendo ◴[19 Apr 24 12:02 UTC] No.40085723[source]▶
And if you took each atom of all the humans alive and stacked them in a line (assuming 1 angstrom per atom and 7E17 atoms in a human), it would be roughly 60 light years long.
replies(2): >>40087855 #>>40094067 #
1. skinner_ ◴[20 Apr 24 02:17 UTC] No.40094067[source]▶
But if you pack the same atoms in a cube, that's 17 centimeters. ((8e9*7e17)^(1/3)*1e-10=0.17)
replies(1): >>40180047 #
2. ninkendo ◴[27 Apr 24 14:06 UTC] No.40180047[source]▶
Late reply but my original numbers were wrong, it’s 7E27 atoms in a human according to wolfram, I think I just misinterpreted its original output when I tried to put it all in one formula: https://www.wolframalpha.com/input?i=how+many+atoms+in+a+hum...

The answer is still close to 60 LY (73.99LY) but it changes the cube size significantly:

https://www.wolframalpha.com/input?i=%288e9*7e27%29%5E%281%2...

(8e9*7e27)^(1/3)*1e-10 = ~382 meters on each side of the cube.