CAPE CANAVERAL, Florida -- NASA called off the launch of space shuttle Discovery for a second time Tuesday after a critical fuel valve failed to work properly. Launch officials halted the countdown ...

CAPE CANAVERAL -- Discovery and seven astronauts will remain grounded until at least Friday so technicians can test a faulty propulsion system valve that failed as the shuttle was being fueled Tuesday ...

NASA engineers are testing a leaky helium valve on the space shuttle Discovery to see if the shuttle can still launch to the International Space Station next month or if it must stand down for repairs ...

Thisstory was updated at 7:00 p.m. EDT. CAPECANAVERAL, Fla. - A broken valve on the space shuttle Discovery forced NASA tocall off the spacecraft?s second launch attempt in a row late Tuesday ...

CAPE CANAVERAL, Fla. — This week’s test to verify a modification to space shuttle Atlantis’ fuel tank ended up revealing a leaky valve in one of the shuttle’s main engines, a problem that would have ...

Thisstory was updated at 10:20 p.m. EST. NASA hasdelayed the planned Feb. 12 launch of the space shuttle Discovery by at least aweek to allow extra time to evaluate vital fuel valves on the spacecraft ...

Many call it the most dangerous part on the space shuttle, and after nearly two years of intensive redesign work, it remains a major concern to astronauts, outside experts and some NASA engineers. The ...

NASA on Tuesday delayed next week's launch of space shuttle Discovery while it runs tests to determine whether newly installed valves would cause serious damage if they broke during liftoff. The ...

NASA called off Thursday’s launching of the space shuttle Discovery because of concerns over a bolt on the external fuel tank and a propellant system valve. It was postponed until at least Monday.

NEW YORK—NASA delayed the planned Feb. 12 launch of the Space Shuttle Discovery by at least a week to allow extra time to evaluate vital fuel valves on the spacecraft. Discovery was slated to deliver ...