Today marks 39 years since the tragic Space Shuttle Challenger disaster, honoring the brave pioneers who lost their lives in space.

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.

Sierra Space officials announced the autonomous spacecraft successfully completed and passed testing milestones in collaboration with NASA.

SpaceX's Starship mega-rocket has stumbled on the road to commercial use. On Thursday, it unexpectedly dropped out of communications and exploded as it screamed toward space for its seventh flight.

On Tuesday, the nation marks the 39th anniversary of the explosion that destroyed Challenger 73 seconds after liftoff after a failure in the shuttle’s right solid rocket booster. Americans were ...