NASA is considering whether the space shuttle Discovery needs to dodge a piece of space junk before heading for a scheduled landing back on Earth.
Mission Control says the debris apparently came off the linked shuttle and international space station during a spacewalk Saturday. Eperts do not know what the piece is.
The shuttle is scheduled to land Thursday evening but thunderstorms could keep it in orbit an etra day or two.
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If Discovery skips Florida on Thursday, NASA will consider the backup touchdown site in California as early as Friday.
Discovery spent more than a week at the space station. Returning astronaut Timothy Kopra lived there nearly two months.