...scattering radioactive fragments over the wilderness but causing no injuries. A year later, the unoccupied U.S. Skylab space station fell to Earth, spreading debris over western Australia. No one was hurt.

...spaceflight, NASA has flown only two missions over Christmas: the Apollo 8 mission to the moon in 1968 and the Skylab space station in 1973. The shuttle is due back next Monday. NASA wants the shuttle back on Earth before New Year's because...