CAPE CANAVERAL, Fla. - NASA officials, astronauts, schoolchildren and family members of Columbia's lost shuttle crew gathered to remember the seven who died while returning from space five years ago.
Could ancient microbes still be hiding on Mars—preserved for millions of years in ice? A new NASA and Penn State study ...
The sun has become more and more active over the last 16 years, in a turn that surprised scientists and could affect space ...