A SpaceX Falcon 9 rocket stage is expected to slam into the Moon on Wednesday, August 5, giving astronomers across parts of the US and Canada a rare chance to try to capture an artificial impact on the lunar surface. The discarded rocket stage is expected to hit the Moon at about 6:35 a.m. UTC (2:35 a.m. EDT) near the lunar limb, potentially producing a brief flash and a much longer plume of dust and debris, according to CBC News.