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. Read more about it here on the BBC website: http://news.bbc.co.uk/2/hi/science/nature/2251386.stm If it is determined that J002E3 is natural it will become Earth's third natural satellite. 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.