More on SpaceX's Falcon 9 - and the 4,000kg piece set to hit the Moon

SpaceX's Falcon 9 is a reusable, two-stage rocket designed and manufactured for, what the company calls "the reliable and safe transport of people and payloads into Earth orbit and beyond". This specific rocket was launched as part of a US and Japanese mission to carry a pair of lunar landers and scientific equipment to the Moon last year. Part of the Falcon 9 is reusable and designed to return back to Earth for its next mission. But some parts of the rocket are shed in space and remai