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

Corrections & Clarifications: An earlier version of this story misstated the date of the Space Shuttle Columbia disaster ... Nancy Reagan − "Oh my God, no!" − captured the horror of the ...

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 ...

On that chilly January day in 1986, students and teachers across the nation waited in awe and wonder, primed to watch and learn from the first teacher in space ... the shuttle in the background ...

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.