A map of the atomic hydrogen (HI) 21-cm line emission (shown as the red haze) in the vicinity of Stephan's Quintet, a famous compact group of galaxies discovered in 1887, overlaid on a deep optical color image. (IMAGE)

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A map of the atomic hydrogen (HI) 21-cm line emission (shown as the red haze) in the vicinity of Stephan's Quintet, a famous compact group of galaxies discovered in 1887, overlaid on a deep optical color image.

Caption

A map of the atomic hydrogen (HI) 21-cm line emission (shown as the red haze) in the vicinity of Stephan's Quintet, a famous compact group of galaxies discovered in 1887, overlaid on a deep optical color image

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NASA, ESA, CSA, and STScI

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