NASA marks 40th anniversary of Apollo 8 mission to the Moon

The Apollo 8 space vehicle launches from Pad A, Launch Complex 39, at the Kennedy Space Center in Florida at 7:51 a.m., December 21, 1968. Apollo 8 was the first manned mission to the moon and entered lunar orbit 40 years ago on Christmas Eve, December 24, 1968. (UPI Photo/NASA)