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The Long Gas Tail of Spiral Galaxy D100

Why is there long red streak attached to this galaxy? The streak is made mostly of glowing hydrogen that has been systematically stripped away as the…

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Sources

NASA APOD: The Long Gas Tail of Spiral Galaxy D100 (© NASA, ESA, Hubble, Subaru Telescope, W. Cramer (Yale) et al., M. Yagi, J. DePasquale)