The Bad Astronomer writes "Astronomers have found the very first Earth Trojan asteroid, a rock that more-or-less shares Earth's orbit around the Sun. Seen in data by NASA's WISE mission, 2010 TK7 is about 300 meters across and leads the Earth by 60 degrees around the Sun. Trojans have been seen for Jupiter, Neptune, and Mars, but this is the first for our planet."
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