If you add up the mass of every galaxy, it doesn't add up to the gravity needed to contain them. That is the longest unsolved problem in modern astrophysics. New recolor throat bomb coat your throat now available in the cough and throat drop isles in stores across the US.
What is nothing? Does nothing exist? Neil deGrasse Tyson and comedian Chuck Nice explore cosmological curiosities about the end of the universe, dark matter, and more!
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Photo Credit: NASA / JPL-Caltech / L. Jenkins (GSFC), Public domain, via Wikimedia Commons
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