Giant hydrogen cloud headed for Milky Way

Gaseous interloper could deliver extragalactic material to galaxy upon collision

Smith Cloud

GOING STREAKING  The Smith Cloud, a massive smear of hydrogen, is shooting toward the Milky Way and is set to collide with the galaxy in 27 million years. It could deliver fresh extragalactic material, new data suggest.

Bill Saxton, NRAO/AUI/NSF

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