Did a Galaxy Collide With a Dark Matter Clump?

Did a Galaxy Collide With a Dark Matter Clump?
NASA, ESA, Hubble SM4 ERO Team via AP

Millions of years, ago, astronomers say, a ball of dark matter with the mass of about five million suns appears to have ploughed through a long stream of stars, disrupting their flow in a way that can only be explained by an interaction with something unknown, but massive.

“We see stars pulled out of this stream by a dark object,” Ana Bonaca, an astronomer at Harvard University's Centre for Astrophysics, in Massachusetts, US reported this week at a meeting of the American Astronomical Society in St Louis, Missouri.

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