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Nature 454, xi (21 August 2008) | doi:10.1038/7207xia; Published online 20 August 2008

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Making the paper: Andrew Fabian

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Giant galaxy's filamentous structure is held stable by magnetic fields.

Bright streams of gas fan out from NGC 1275 — the giant elliptical galaxy at the centre of the Perseus constellation — making it look a bit like a supersized space jellyfish. These filaments are thought to be around 100 million years old, and although they appear static, they are buffeted by the extreme pressure and heat of the gases that surround them.