Impact came shortly after 7:30 a.m. ET on Friday, and indications were that instruments watching the crash were working properly. They included spectrometers, instruments that measure the chemical composition of the plume kicked up by the crashing rocket.
Useful data also was expected from the LCROSS satellite, flying a few hundred miles behind its Centaur booster. The satellite had four minutes to transmit its findings before it, too, hit the surface.