Over its six decades of taking on dangerous missions, NASA has suffered thankfully few tragedies that resulted in the loss of life—the Apollo 1 accident, plus the Challenger and Columbia space shuttle disasters. NASA’s Johnson Space Center is now paying tribute to those shuttle missions, STS-51 and STS-107, in a new exhibit that displays debris from the shuttle disasters as a memorial to the lives lost. This is the first time wreckage from either disaster has been put on public display. (The command service module for Apollo 1 is at NASA’s Ames facility, but not on display.) The exhibit features a fuselage section from Challenger and a flight deck window from Columbia, as well as personal effects from the seven lives lost in each accident. The 2,000 square foot memorial, Forever Remembered, is now a permanent display at Johnson.Source: GizmodoJohn WenzWriterJohn Wenz is a Popular Mechanics writer and space obsessive based in Philadelphia. He tweets @johnwenz.