Video footage shows the moment Chris Cassidy radioed mission control to report the UFO flying past him. A small, round object can be seen making its way towards the artificial satellite as an orange glow trails. Another angle reveals how the article seems to be moving upwards, before completely disappearing out of shot.
A woman, on the other end of the radio, is quick to set the record straight, revealing to Cassidy it is not a UFO.
"What we are looking at is an antenna cover – this was identified by the Russian mission flight controllers," she says.
However, the bizarre incident, which occurred on August 19, 2013, is still being talked about to this day.
The clip has now racked up more than 100,000 hits, with many believing it is the best evidence to support that aliens could be watching the ISS.