FAJARDO, Puerto Rico—"We could have just stayed in bed" was one comment I overheard this morning from planetary scientists who had woken up early to see NASA's Lunar Crater Observation and Sensing Satellite (LCROSS) crash into the lunar surface. At 7:31 A.M. (Eastern Daylight Time) the spacecraft's Centaur-class rocket booster slammed (deliberately) into the moon, the idea being to set off a dramatic explosion and