Shuttle Discovery heads for Earth

Houston -- The crew of Discovery woke up Monday to The Star Spangled Banner as the space shuttle prepared for a landing in Florida, weather permitting, NASA said.

The wake-up call came at 12:21 a.m. EDT, the space agency said. Discovery is scheduled to touch down at 8:48 a.m. at Kennedy Space Center but NASA said Sunday night weather may interfere with those plans -- with forecasters calling for high overcast and two layers of scattered clouds.

The backup landing site is Edwards Air Force Base, Calif.

The mission featured three spacewalks. NASA said Thursday a fourth had been considered to replace a jammed International Space Station nitrogen tank but officials decided it was not needed.

Copyright 2010 United Press International, Inc. (UPI).

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