Auction house Christie's are marking the 50th anniversary of the moon landings by putting nearly 200 lunar-related artefacts up for sale. One Giant Leap: Celebrating Space Exploration 50 years after Apollo 11 was open to the public in New York on Wednesday.

The most valuable piece in the collection is thought to be the Apollo 11 Lunar Module Timeline Book which could fetch somewhere between $7-9 million (€6-8 million) at auction on July 18.

The Timeline Book narrates the entire Eagle voyage from inspection, undocking, lunar surface descent, stay, and ascent, to the rendezvous with the command module Columbia in lunar orbit. The book was flown aboard the Eagle and was located precisely between Neil Armstrong and Buzz Aldrin as they made the historic landing.

Christina Geiger, Head of Books & Manuscripts at Christie's, explained that the auction encompassed the entirety of the US manned-spaceflight programme, from Mercury and Gemini through to Apollo.

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