NASA engineers think the object may have shook loose from the shuttle during the firing of jets in preparation for landing.
*snort* Yeah, can anybody say cover up??
And in honor of talk like a pirate day...
Arrr, "big intarst in whether we're goin' t' be doin' any robotics tomorrow," said Atlantis commander Brent Jett, referrin' t' usin' the shuttle's robotic arm t' inspect the spacecraft. Ye'll ne'er get me buried booty!