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KNOXVILLE, Tenn. A comet that is unexpected brightly in the past few weeks is now visible to the naked eyes and is attracting professionals and amateur.

The comet is exploding and its coma, a cloud of gas and dust illuminated by the sun, has grown to be bigger than the planet Jupiter.

Scientists speculate the comet has exploded because there are sinkholes in its nucleus, giving it a honeycomb-like structure. The collapse exposed comet ice to the sun, which transformed the ice into gas.

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