Pi Day occurs on March 14, because the date is written as 3.14 in the United States. Pi is the ratio of the circumference of a circle to its diameter, or approximately 3.14 (its exact value is ...

Butch Wilmore and Suni Williams, who have been in space since last June, are one step closer to coming home ...

CAPE CANAVERAL, Fla. (AP) — A new crew launches to the International Space Station to replace NASA's two stuck astronauts.