(CNN) – Two U.S. spacecraft are set to crash on the moon Friday. On purpose. And we're all invited to watch. [cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/TECH/space/10/08/probe.moon.crash/art.lcross.nasa.jpg caption="An artist's rendering shows the LCROSS spacecraft, left, separating from its Centaur rocket."] NASA's Lunar Crater Observation and Sensing Satellite is scheduled to drop its Centaur upper-stage rocket on the lunar … Continue reading NASA to give moon 1-2 punch in search of water