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Gigantic Gas Cloud on Collision Course With Our Galaxy

In case you didn't know, a huge -- like, on a galactic scale -- cloud of gas is currently speeding toward our galaxy at 700,000 mph.

January 29, 2016
6:50 AM EST
Diagram of the 100-million-year "boomerang" trajectory of the Smith Cloud. | NASA, ESA, A. Field and A. Fox (STScI).