A fast-moving object spotted flying by the International Space Station moments before its livestream went dead has conspiracy theorists claiming NASA is covering up proof of a UFO.

In the footage from the ISS channel uploaded to YouTube by user ColdPyro, a white speck can be seen emerging from the darkness just above Earth’s horizon.

Right before the 'UFO' travels out of view, the feed cuts to a grey screen, followed by a statement asking users to ‘please stand by’ due to technical issues.

A fast-moving object spotted flying by the International Space Station moments before its livestream went dead has conspiracy theorists claiming NASA is covering up proof of a UFO.

In the footage from the ISS channel uploaded to YouTube by user ColdPyro, a white speck can be seen emerging from the darkness just above Earth’s horizon.

Right before the 'UFO' travels out of view, the feed cuts to a grey screen, followed by a statement asking users to ‘please stand by’ due to technical issues.

A blue screen follows this, and then a statement:

‘Please stand by. The High Definition Earth Viewing experiment is either switching cameras, or we are experiencing a temporary loss of signal with the International Space Station.’

This isn’t the first time UFO hunters have spotted something strange near the ISS.

Just last month, alien enthusiasts claimed a strange light captured in the livestream was a glowing blue UFO hovering close to the space station.

And in September, it was argued that footage from the ISS showed two UFOs traveling around a progress capsule, a feature that’s used to supply the station.

While it isn’t always possible to determine exactly what these objects are during the brief period they appear in the stream, there are a number possible explanations for these types of sightings.

In the past, a Nasa spokesperson has explained, 'Reflections from station windows, the spacecraft structure itself or lights from Earth commonly appear as artefacts in photos and videos from the orbiting laboratory.'