NEW YORK (CBSNewYork/AP) –– Moon dust collected by Neil Armstrong during the first lunar landing is being sold at a New York auction.

The lunar dust, plus some tiny rocks that Armstrong also collected, are zipped up in a small bag and are worth an estimated $2 million to $4 million.

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They’re just some of the items linked to space travel that Sotheby’s is auctioning off to mark the 48th anniversary of the first lunar landing on July 20.

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Armstrong’s snapshot of fellow Apollo 11 astronaut “Buzz” Aldrin standing on the moon could go for up to $4,000. Also on the block, is a documented flight plan that astronauts used to return to Earth.

Armstrong was the first man to walk on the moon. He died in 2012 in Ohio.

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