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Earthrise - Apollo 8, December 24, 1968. This view of the rising Earth greeted the Apollo 8 astronauts as they came from behind the Moon after the fourth nearside orbit. The photo, by astronaut William Anders, is displayed here in its original orientation, though it is more commonly viewed with the lunar surface at the bottom of the photo. Earth is about five degrees left of the horizon in the photo. The unnamed surface features on the left are near the eastern limb of the Moon as viewed from Earth. The lunar horizon is approximately 780 kilometers from the spacecraft. Height of the photographed area at the lunar horizon is about 175 kilometers. Artist William A Anders. (Photo by /Heritage Images via Getty Images)

Earthrise - Apollo 8, December 24, 1968. This view of the rising Earth greeted the Apollo 8 astronauts as they came from behind the Moon after the fourth nearside orbit. The photo, by astronaut William Anders, is displayed here in its original orientation, though it is more commonly viewed with the lunar surface at the bottom of the photo. Earth is about five degrees left of the horizon in the photo. The unnamed surface features on the left are near the eastern limb of the Moon as viewed from Earth. The lunar horizon is approximately 780 kilometers from the spacecraft. Height of the photographed area at the lunar horizon is about 175 kilometers. Artist William A Anders. (Photo by /Heritage Images via Getty Images)
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Apollo 11 Lunar Module ascent stage photographed from Command Module, July 21, 1969. The Apollo 11 Lunar Module, with astronauts Neil A. Armstrong and Edwin E. Aldrin Jr. aboard, is photographed from the Command and Service Modules. This view is looking west with the Earth rising above the lunar horizon. Astronaut Michael Collins piloted the Command/Service Module in lunar orbit while Armstrong and Aldrin explored the Moon. The Lunar Module is approaching from below. The mare area [huge dry plain on the surface of the Moon] in the background is Smyth's Sea. At right center is International Astronomical Union crater no. 189. Artist Michael Collins. (Photo by Heritage Space/Heritage Images via Getty Images)

Apollo 11 Lunar Module ascent stage photographed from Command Module, July 21, 1969. The Apollo 11 Lunar Module, with astronauts Neil A. Armstrong and Edwin E. Aldrin Jr. aboard, is photographed from the Command and Service Modules. This view is looking west with the Earth rising above the lunar horizon. Astronaut Michael Collins piloted the Command/Service Module in lunar orbit while Armstrong and Aldrin explored the Moon. The Lunar Module is approaching from below. The mare area [huge dry plain on the surface of the Moon] in the background is Smyth's Sea. At right center is International Astronomical Union crater no. 189. Artist Michael Collins. (Photo by Heritage Space/Heritage Images via Getty Images)
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Hulton Archive Heritage Images