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Comet-chasing probe
The comet-chasing space probe Rosetta woke up Monday after nearly three years in hibernation and sent a signal 500 million miles back to Earth: "Hello World!" Msn Reporter says.
After almost three years of hibernation, a comet-chasing spacecraft sent its first signal back to Earth on Monday, prompting cheers from scientists who hope to use it to land the first space lander onto a comet.
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