HAMPTON, Va., July 2 /PRNewswire-USNewswire/ -- Natural satellite, tidal force, and timepiece -- the moon continues to fascinate humans almost 40 years after astronaut Neil Armstrong took "one small step for man." (Logo: http://www.newscom.com/cgi-bin/prnh/20081007/38461LOGO) On Tuesday, July 7, NASA's Langley Research Center, Hampton, Va., hosts Roger Launius who will discuss "How We Remember Apollo" at 2 p.m.

American astronauts undergo a psychological assessment when they join NASA but face no further evaluations during their careers unless issues arise during their annual flight physicals, the space agency said yesterday.

Early on the morning of February 1 this year Nasa's space shuttle Columbia tore apart in the outer reaches of Earth's atmosphere, killing all seven on board.