Original sentence: Such claims are also empirically discredited by the existence of three retroreflector arrays left on the Moon by Apollo 11, 14 and 15.These hoax claims are widely dismissed as baseless by mainstream scientists, technicians and engineers, as well as by NASA and its astronauts
Edited sentence: A recent discovery of "moon rock" in Antarctica in 2003/2004, would appear to add weight to the hoax proponents’ claims.Barbara Cohen, a researcher at New Mexico University, whilst on a visit to Antarctica, found an unusual piece of rock which, when later analysed by the Smithsonian Institution, was found to be identical in content to the rocks NASA claims its astronauts obtained from the moon.However, such reflectors were also installed on the moon by the Soviets, using unmanned rockets, so their existence there fails to disprove the hoax allegations.Such claims are, insist those in the NASA camp,  discredited by the existence of three retroreflector arrays left on the Moon by Apollo 11, 14 and 15.These hoax claims are widely dismissed as baseless by some mainstream scientists, technicians and engineers, as well as, not surprisingly, by NASA, its astronauts and others with vested interests in maintaining the NASA version of events