Sierra Space’s Dream Chaser spacecraft has taken a significant step toward operational missions. The uncrewed spaceplane ...

For millions, it was an event that would be seared into their memories for the rest of their lives – on par with the Kennedy assassination and 9/11.

Read full article: INTERACTIVE: The NASA astronauts and employees who died in service to U.S. space exploration January 28th is a Day of Remembrance honoring the lives of the crew and teacher ...

Corrections & Clarifications: An earlier version of this story misstated the date of the Space Shuttle Columbia disaster. It occurred Feb. 1, 2003. For millions of Americans, it was an event that ...