see more

1969: A close-up of a sample of moon rock brought back from the Apollo 11 mission. (Photo by MPI/Getty Images)

1969:  A close-up of a sample of moon rock brought back from the Apollo 11 mission.  (Photo by MPI/Getty Images)

see more

RUSSIA - JANUARY 01: The Russian Engineer Sergei Korolyov (Photo by Keystone-France/Gamma-Keystone via Getty Images)

RUSSIA - JANUARY 01:  The Russian Engineer Sergei Korolyov  (Photo by Keystone-France/Gamma-Keystone via Getty Images)

see more

30th July 1970: A close-up of a slice of lunar rock sample 12013, brought back from the Apollo 12 (Apollo XII) mission to the Manned Spacecraft Centre, Houston, Texas. Analysis reveals the rock to be around 4.6 billion years old. (Photo by MPI/Getty Images)

30th July 1970:  A close-up of a slice of lunar rock sample 12013, brought back from the Apollo 12 (Apollo XII) mission to the Manned Spacecraft Centre, Houston, Texas. Analysis reveals the rock to be around 4.6 billion years old.  (Photo by MPI/Getty Images)

see more

Russian cosmonaut Yuri Gagarin and rocket engineer Sergey Korolyov, 1961. Pictured at Baikonur Cosmodrome, USSR. Korolyov (1907-1966) was the leading Soviet rocket engineer and spacecraft designer during the space race between the Soviet Union and the Uni (Photo by Fine Art Images/Heritage Images/Getty Images)

Russian cosmonaut Yuri Gagarin and rocket engineer Sergey Korolyov, 1961. Pictured at Baikonur Cosmodrome, USSR. Korolyov (1907-1966) was the leading Soviet rocket engineer and spacecraft designer during the space race between the Soviet Union and the Uni (Photo by Fine Art Images/Heritage Images/Getty Images)

see more

UNITED STATES - MAY 07: Schmitt is seen collecting Moon samples by a large lunar boulder, with part of the Lunar Rover in the foreground. Apollo 17, the sixth and last manned mission to the Moon, with astronauts Eugene Cernan, Ronald Evans and Schmitt on board, was launched on 7th December 1972. Schmitt, the twelth man to walk on the Moon, was also the first geologist to set foot on its surface. The battery powered Lunar Rover, first used on the Apollo 15 mission, significantly increased the amount of ground the astronauts could cover in the course of their exploration of the lunar surface. (Photo by SSPL/Getty Images)

UNITED STATES - MAY 07:  Schmitt is seen collecting Moon samples by a large lunar boulder, with part of the Lunar Rover in the foreground. Apollo 17, the sixth and last manned mission to the Moon, with astronauts Eugene Cernan, Ronald Evans and Schmitt on board, was launched on 7th December 1972. Schmitt, the twelth man to walk on the Moon, was also the first geologist to set foot on its surface. The battery powered Lunar Rover, first used on the Apollo 15 mission, significantly increased the amount of ground the astronauts could cover in the course of their exploration of the lunar surface.  (Photo by SSPL/Getty Images)