Moon dust collected by Neil Armstrong to be sold at auction

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.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.Armstrong's snapshot of fellow Apollo 11 astronaut "Buzz" Aldrin standing on the moon could go