Scientists are preparing to study the effects of human-made impacts on the moon when a spent SpaceX rocket stage impacts the lunar surface on Aug. 5. On Aug. 5, Earth's moon is due for a human-made, high-speed impact from an identified flying object: a spent SpaceX Falcon 9 upper stage. The event will lead to a literal "dust up" on the lunar landscape. That Falcon 9 upper stage is a leftover from ... [4181 chars]