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Look up at the sky on a given night and it will be a tad different than the night before, or the night after. The position of stars will change, as will the planets and the phase and path of the moon. But no matter where you are on Earth and what part of the universe you find yourself peering into, one thing remains constant. Space is black. At least space (and the night sky) appears black. True black, the way a physicist might define it, anyway, is the absence of light. Even the most seemingly-empty regions of the night sky aren’t devoid of light, it’s just that it’s at wavelengths far beyond what our eyes can see. Check out this video from Dr. Gabe and PBS Space Time and turn back the clock about 13.7 billion years to a time when the universe was… orange? And since there’s no better way to end a post than with a science pun, I leave you with this: Q: Why did space used to be orange? A: Because it’s full of Vitamin CMB! PREVIOUSLY: There’s a lot more colors to the visible universe than black and orange. Discover what the stars in the sky have in common with a latté.
Look up at the sky on a given night and it will be a tad different than the night before, or the night after. The position of stars will change, as …