A Long-Lost Gas Cloud Will Slam into Our Galaxy in 30 Million Years

New observations by NASA's Hubble Space Telescope suggest that the gas, called Smith's Cloud, was cast from the Milky Way long ago. A new NASA video describes the cloud's discovery in 1963 and what researchers know. "We don't fully understand the Smith Cloud's origin," Andrew Fox, an astronomer at the Space Telescope Science Institute who led the research, said in a statement from NASA.

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