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If our sun went dark (for the purpose of this question), which represents a larger (for very small values of larger) source of power, the stars (starlight) or background radiation?

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    $\begingroup$ Do you mean the cmb or radiation from other sources $\endgroup$ – user108787 Sep 6 '16 at 19:55
  • $\begingroup$ Radiation from other sources of its substantial. I'm just curious how small the levels are and couldn't find a source anywhere for the power from the distant stars that hits us. $\endgroup$ – Seph Sep 6 '16 at 20:21
  • $\begingroup$ And also, do you mean from the stars in the sky you can see, say maximum a hemisphere. Thanks $\endgroup$ – user108787 Sep 6 '16 at 20:21
  • $\begingroup$ Yeah, I was looking all over for that. One source says The total brightness [including airglow] of the sky on a clear, moonless night is about 2E-003 lux. Sirius, the brightest visible star, contributes about 1E-005 lux. but it does not specify the complete sphere or a hemisphere. I would guess most radiation from dust clouds etc is very cold, so my money is on the stars. $\endgroup$ – user108787 Sep 6 '16 at 20:23
  • $\begingroup$ similar question Number density of CMB photons? with a very relevant answer $\endgroup$ – user46925 Sep 6 '16 at 23:03

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