Get your used astronaut eyeglasses here

If collecting space memorabilia is your thing, check out the 2009 April Signature Space Exploration Auction. Among the items up for bid from astronauts' personal collections are the bifocals John Young wore on the first Spacelab flight (right), a hand controller grip used by Gene Cernan during the Apollo 10 mission around the moon, and the letter clearing Mercury astronaut Deke Slayton to fly in space after years of being grounded by a medical problem.

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Tony Reichhardt is a senior editor at Air & Space.