NASA - National Aeronautics and Space Administration

Discovery is set for a launch attempt Friday at 11:59 p.m., as engineers will evaluate a liquid hydrogen valve that developed problems during tanking operations Tuesday evening.

NASA's Mars Reconnaissance Orbiter put itself into a safe mode Wednesday morning, Aug. 26, for the fourth time this year, while maintaining spacecraft health and communications.

More powerful computers needed to process the sophisticated computer models used in climate forecasts are now being developed at Goddard.