Hubble telescope spies incoming comet ISON

CAPE CANAVERAL (TIP): A recently discovered comet, dazzlingly bright even though it is still almost as far away as Jupiter, is racing toward a November rendezvous with the sun, officials said on Tuesday. If it survives the encounter — and that’s a big if — the comet may be visible even in daylight in Earth’s skies at the end of the year. Discovered by amateur astronomers in September 2012, Comet ISON is about to reach the outer edge of the asteroid belt, located some 280 million miles (451 million km) from Earth, said William Cooke, lead scientist at Nasa’s Meteoroid Environment Office at the Marshall Space Flight Center in Huntsville, Alabama. The comet is shedding dust from its nucleus at a rate of more than 112,000 pounds (50,802 kg) per minute, the result of heating by the sun, observations from Nasa’s Swift telescope show. That level of activity is unusual for a comet still so far away from the sun. It could spell its doom. Preliminary measurements made with the Hubble Space Telescope, which captured an image of the comet that was released on Tuesday, indicate Comet ISON’s body is no more than 4 miles (6.4 km) in diameter.

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