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This is Scientific American 60-Second Science. I'm Steve Mirsky. Got a minute?

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A recently discovered breed of galaxies really caught astronomers¡¯ attention.

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Because they look like jellyfish.

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Astronomers found the first jellyfish galaxy a decade ago.

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Such a galaxy has a disk of stars, like our Milky Way, plus long blue tendrils.

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A jellyfish galaxy was once a spiral like the Milky Way, spawning new stars from its gas and dust.

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But unlike the Milky Way, a jellyfish belongs to a cluster of galaxies.

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A recent analysis of Hubble telescope images led to the conclusion that extremely hot gas from the cluster is behind the formation of jellyfish.

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That study is in the Astrophysical Journal Letters.

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As the galaxy plows through space, this hot gas rips out the galaxy's own gas and dust, forming the long streamers behind the galaxy.

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This torn-out gas still gives birth to new stars.

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The brightest of these newborn stars shine blue.

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So the former disc-shaped galaxy metamorphosizes into a celestial jellyfish sporting long blue tendrils.

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The galaxy will eventually literally run out of gas, and thus lose the ability to create any more new stars.

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Jellyfish in the sea can be deadly.

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But in space, the mortally wounded victim is the jellyfish galaxy itself.

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Thanks for the minute, for Scientific American's 60-Second Science.I'm Steve Mirsky.

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