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From:
http://news.bbc.co.uk/2/hi/science/nature/2251386.stm
New 'moon' found around Earth
An amateur astronomer may have found another moon of the Earth. Experts say it may have only just arrived.
Much uncertainty surrounds the mysterious object, designated J002E3. It could be a passing chunk of rock captured by the Earth's gravity, or it could be a discarded rocket casing coming back to our region of space.
It was discovered by Bill Yeung, from his observatory in Arizona, US, and reported as a passing Near-Earth Object.
It was soon realised, however, that far from passing us, it was in fact in a 50-day orbit around the Earth.
Earth's new 'moon' is space junk - http://news.bbc.co.uk/2/hi/science/nature/2253385.stm
Earth's second one is called Cruithne. It was discovered in 1986 and it takes a convoluted horseshoe path around our planet as it is tossed about by the Earth's and the Moon's gravity.
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