jc42 writes "Astronomers have been looking at the first images of asteroid 2007 TU24, the 250-meter asteroid that will pass 540,000 km from the Earth at 8:33 UTC (3:30 EST) Tuesday morning. So get your telescopes out; it's a 10th-magnitude object. Or just hold your breath as the time approaches. It might be sobering to consider that it was just discovered last October, and we know about maybe half of the objects like this in Earth-crossing orbits."
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