The dark matter hypothesis isn’t perfect, but the alternatives are worse

You may not be a fan of dark matter, the hypothetical particle that makes up the bulk of the mass in the universe. And it’s true that the dark matter hypothesis has its shortcomings — and, of course, we haven’t found any dark matter particles yet. But the truth is that the alternatives are much worse.

The universe is full of unexplained mysteries (which is what keeps astronomers and astrophysicists happily employed), and many of those mysteries surround gravity. As we watch stars orbit the centers of their galaxies, we find that they’re moving far too quickly given the amount of visible matter that can keep them in those orbits with its gravity. 

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