sentences:  The test was done by a group of researchers headed by Alexander Nemchin at Curtin University of Technology in Bentley, Australia.The detection on Earth of reflections from laser ranging retro-reflectors (LRRRs, or mirrors used as targets for Earth-based tracking lasers) on Lunar Laser Ranging experiments left on the Moon is evidence of landings.Quoting from James Hansen's biography of Neil Armstrong, ""