WASHINGTON — The U.S. Air Force awarded Sierra Space a $16 million contract extension to further develop and test its VR35K-A upper stage rocket engine, the Colorado-based aerospace company ...

Last-minute problems forced a launch delay Monday for SpaceX’s mega rocket Starship, attempting a comeback following an explosion on the last test flight.

Last-minute problems forced a launch delay Monday for SpaceX’s mega-rocket Starship, attempting a comeback following an explosion on the last test flight. The countdown got down to the 40-second ...