Neil Armstrong on the moon next to an American flag. Laika the dog sitting in a space capsule, shortly before becoming the first animal to orbit the Earth. Buzz Aldrin taking a selfie, our planet a blue curve behind him, in the first-ever self portrait produced in space.
These are just three of the 2,400 rare NASA photos now up for sale in an online auction hosted by the Christie's. The images capture "the golden age of space exploration," the auction house said in a press release.
The collection of original photographs spans a number of historic missions, from the Mercury and Gemini spaceflight programs to the Apollo moon missions. Some of the images are now iconic, like the "Blue Marble" picture taken by the crew of the Apollo 17 -- the first fully illuminated photo of Earth taken by a human in space.
Others, however, were not released by NASA at the time they were taken, and are new to the general public.
The most expensive item on offer is the only photo showing Armstrong on the Moon, taken by Aldrin during the Apollo 11 mission in 1969. It's estimated to be worth between £30,000 and £50,000, according to the auction house.
Other high-value images include "Blue Marble," which is estimated to sell for up to £25,000, and a photo of the first "Earthrise" seen by humans in space, dated 1968 and worth up to £30,000.
The astronauts were instructed on how to take photos in space by NASA, alongside specialists from the likes of Kodak and National Geographic.
"Through their cameras, the astronauts-turned-artists were able to convey to mankind the beauty and profundity of their experience into space, forever changing the way we see ourselves and our place in the universe," said the release.
For decades, the unreleased photos were kept in the archives of the Manned Spacecraft Center in Houston, Texas, and could only be accessed by accredited researchers. The items, assembled over the course of 15 years by private collector Victor Martin-Malburet, have been exhibited in museums around the world including the Grand Palais in Paris and the Kunsthaus in Zurich.
The online sale, named "Voyage To Another World: The Victor Martin-Malburet Photograph Collection," runs through November 19.