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Alex
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Something’s fishy in the southern constellation Phoenix.

Strange radio emissions from a distant galaxy cluster take the shape of a gigantic jellyfish, complete with head and tentacles. Moreover, the cosmic jellyfish emits only the lowest radio frequencies and can’t be detected at higher frequencies. The unusual shape and radio spectrum tell a tale of intergalactic gas washing over galaxies and gently revving up electrons spewed out by gargantuan black holes long ago, researchers report in the March 10 Astrophysical Journal.

Spanning 1.2 million light-years, the strange entity lies in Abell 2877, a cluster of galaxies 340 million light-years from Earth. Researchers have dubbed the object the USS Jellyfish, because of its ultra-steep spectrum, or USS, from low to high radio frequencies.

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Alex
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On July 4, 1054, Chinese astronomers recorded a “guest star” in the Taurus constellation.
Later research uncovered contemporaneous sightings in Japan and the Middle East.
Temporarily outshining Venus, it faded after about two years: a common supernova.

Hundreds of years later, its remnant was astronomically discovered.

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