How Much Light Should We Be Seeing?

Stepen sina: In the past there was this big question about how much light should we be seeing. And in what sort of answers did they come up with? Hopefully, although the answers we have now are better. Proxima centauri is 270 thousand times further from the earth than the sun is. That means that proxima centauris light gets reduced by one over ten to the 11 relative to the sun.