March 25

1655 - Saturn's largest moon, Titan, is discovered by Christian Huygens.
1939 - Star Trek writer D.C. Fontana is born.
1979 - The first fully functional space shuttle orbiter, Columbia, is delivered to the John F. Kennedy Space Center to be prepared for its first launch.
1992 - Cosmonaut Sergei Krikalev returns to Earth after a 10-month stay aboard the Mir space station.