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Superflare From Crab Nebula Has Astronomers Mystified

Monday, May 16, 2011 14:26

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A Hubble visible light image of the Crab Nebula inset against a full-sky gamma ray map showing the location of the nebula (crosshairs).
CREDIT: NASA

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The Crab Nebula, the dusty remains of an exploded star, has unleashed a surprisingly massive flare that is five times more powerful than any eruption previously seen from the celestial object, leaving scientists struggling to explain the event, NASA says.

The so-called “superflare” was detected on April 12 by NASA’s Fermi Gamma-ray Space Telescope, which is continuously mapping the sky in gamma ray wavelengths in search of gamma-ray bursts, the brightest explosions in the universe. [Video: Supernova Spits New Gamma-Ray Fire]

The Crab Nebula’s strong outburst lasted six days, and its exact cause has scientists scratching their heads, especially since the superflare followed an earlier gamma-ray flare from the nebula in January.

“These superflares are the most intense outbursts we’ve seen to date, and they are all extremely puzzling events,” said Alice Harding at NASA’s Goddard Space Flight Center in Greenbelt, Md., in a statement. “We think they are caused by sudden rearrangements of the magnetic field not far from the neutron star, but exactly where that’s happening remains a mystery.” [Strangest Things in Space]

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