http://www.boston.com/news/local ... nasaap_an_x-ra.html
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The latest estimates are that the plasma will arrive in four waves, one at 3 a.m. Wednesday, one at 1 p.m. Wednesday, one at 8 p.m. Wednesday, and one at 2 a.m. Thursday, said David Aguilar, a spokesman for the Harvard-Smithsonian center.
There is a three-hour window of uncertainty both before and after those target times, he said, because the speed of the waves is not constant.