Space junk floating above Earth? In addition to losing a bolt on this mission (STS115), the shuttle seems to have shaken off an unknown object after testing the reaction control system:
From NASA:
Object Investigation, Weather Force Managers to Wave Off Wednesday Landing
The Mission Control Center in Houston informed the STS-115 crew about 10:45 a.m. EDT that Wednesday’s landing attempts have been waved off due to an unfavorable weather forecast, coupled with the possibility of additional inspections of Space Shuttle Atlantis.
An object was observed by flight controllers using a TV camera on the shuttle in close proximity to the spacecraft. It was observed following standard tests of Atlantis’ reaction control system about 2:45 a.m. today. Flight controllers continue to analyze the situation and are concerned the item may be something that came off of Atlantis.
Image: unknown object in center of highlighted circle (courtesy NASA)