During the live coverage on Saturday, December 8 International Space Station crew members used the station’s 57.7-foot (17.6-meter) robotic arm to capture SpaceX’s Dragon spacecraft and attach it to the orbiting laboratory.
But during the docking procedure of the dragon capsule and the International Space Station suddenly a triangular object comes into the view moving behind the Dragon capsule until it disappears into space.
It is unknown whether the object originated from the ISS or if it was a UFO.
Below the footage of the the triangular object that looks like a typical TR-3B at the moment it passes the Dragon capsule during the streaming of the docking procedure.
You can also see the object around the 1.35 mark at the original SpaceX Live stream.