Tiangong-1 and Shenzhou-8 docked for a second time in space on November 14, 2011.
But baffling footage has now emerged online that appears to show they were not alone.
The video – posted by willease on April 13 – shows the Shenzhou-8 departing from the second craft.
As it drifts into the distance, a bright white light appears in the blackness of space.
It charges directly towards the Shenzhou-8 and appears to flash its lights.
The live feed almost immediately cuts to a different angle after the UFO moves out of sight.
Conspiracy channel The Hidden Underbelly reposted the video to YouTube on Sunday, where he wrote: “After watching the full video it was very obvious that The Tiangong-1 and Shenzhou 8 mission was being monitored by some unknowns.”
Viewers have flocked to the comments section to voice their thoughts.
“Awesome footage,” one wrote.
Another commented: “Seriously weird.”
But a third had a more reasonable explanation, suggesting the “craft” was “probably a particle of ice”.
It is not the first time some of the world’s space agencies have come under scrutiny over their live feeds.
NASA’s live feed was repeatedly cut in 2018 as “huge objects” supposedly appeared.