Sierra Space’s Dream Chaser, the spacecraft that looks like a miniature space shuttle, doesn’t have a target launch date yet but it does have “undisclosed national security and commercial customers,” ...

The launch of the space shuttle Atlantis has been delayed for at least one day while engineers look at a problem with the cooling system for one of the shuttle’s three fuel cells. The fuel cells make ...

Add Yahoo as a preferred source to see more of our stories on Google. A view of the Space Shuttle Endeavour during a preview of the new Samuel Oschin Air and Space Center at the California Science ...