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" ... And this is a problem, because there’s a key question we want to answer about the Universe: how much total light is there coming from beyond our own galaxy? And, if the answer is “more than the galaxies we’ve been able to measure so far,” then there are some follow-up questions: where is that light coming from, and is it confined to individual galaxies, or is some of it diffuse, coming from all directions in the sky? ... "
" ... If you take a look at any galaxy in the Universe that isn’t gravitationally bound to our own, we’ve already learned what’s going to happen to it in the future. Our Local Group, consisting of our Milky Way, Andromeda, and about 60 smaller galaxies, are the only ones bound to us. If you considered any other galaxy as part of the bound structure it’s a member of — like a galaxy pair, group, or cluster — that entire structure is receding from us, with its light systematically shifted towards longer wavelengths: a cosmic redshift. The farther away a galaxy is, on average, the greater the amount of its redshift, implying that the Universe is expanding. ... "
" ... The Milky Way galaxy up through the trees under the starry night sky. ... "