They've just seen the biggest explosion in the history of the program.
"On March 17, 2013, an object about the size of a small boulder hit the lunar surface in Mare Imbrium," says Bill Cooke of NASA's Meteoroid Environment Office. "It exploded in a flash nearly 10 times as bright as anything we've ever seen before."
Anyone looking at the Moon at the moment of impact could have seen the explosion--no telescope required. For about one second, the impact site was glowing like a 4th magnitude star.
A new ScienceCast video describes the bright lunar explosion of March 17, 2013. Play it
More & Video - http://science.nasa.gov/science-news/science-at-nasa/2013/16may_lunarimpact/
Source: NASA Science News.
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