A Nasa astronaut aboard the International Space Station caused a bit of a stir recently when he claimed to have seen an unidentified object floating outside the craft 220 miles above Earth.
Astronaut Chris Cassidy radioed Mission Control to report the object - just to be sure.
But there was an explanation.
NASA astronaut Chris Cassidy radioed Mission Control to report an 'unidentified object' floating outside the International Space Station on Aug. 19, 2013. Was it a UFO? No, NASA says, just an antenna cover from the station's Russian segment.