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Speaking of dark matter, astronomers have uncovered a pretty interesting mystery involving it. Or rather, not involving it: They’ve found a galaxy that apparently has little or no dark matter in it. 

Astronomers face a number of annoying problems we have with the Universe, and one of the biggest is dark matter.

The Dark Energy Survey's results after three years show the distribution of galaxies in the Universe is smoother than expected.

See? Complex. Dark matter is similar to what we think of as normal matter — the kind were made of — in that is has mass and therefore gravity. But it doesnt emit light and doesnt interact with normal matter, making it the devils own game to detect. We have plenty of reasons to think it exists, but weve never been able to directly detect it. Video of Dark Matter: Crash Course Astronomy #41 A lot of potential dark matter candidates have been eliminated over the years, leaving only ever more e...