Three tiny moon rocks were on display before going under the hammer at the Sotheby’s Space Exploration auction in New York. These stones were obtained during a USSR unmanned mission to the moon in 1970, led by a famous Soviet rocket engineer Sergei Korolev. The stones were put on sale for the first time in 1993 after they were given to Korolev’s widow in recognition of his outstanding achievements in space exploration. The lunar samples are estimated to be sold for 700,000 to 1 million USD.