A strange blue light seen hovering in the Earth's orbit has been seized upon by UFO-hunters as evidence of alien life.

The tadpole-shaped illumination, which was caught in NASA's livestream from the International Space Station, was seen flying close to the camera before it cut off.

Stills from the footage, taken on September 30, show the peculiar light gleaming in the atmosphere.

The tadpole-shaped illumination, which was caught in NASA's livestream from the International Space Station, was seen flying close to the camera before it cut off

Stills from the footage, taken on September 30, show the peculiar light gleaming in the atmosphere

The prolific UFO hunter who uploaded the video onto YouTube insisted the light was not caused by the reflection of the sun on the camera lens.

Streetcap1 wrote: 'Unidentified Object is brighter on the left side due to the light from the sun, so not lens flare.

'NASA cut the camera feed so quickly even though this was very distant, but I still managed to get a couple of frames to enlarge.'

Scott Waring, a UFO specialist, said although it appears distant, the light was not very far away from the space station.

He wrote on UFO Sightings Daily: 'This blue-glowing UFO was seen near the space station yesterday by Streetcap1 of YouTube.

'It appears far away, but it is not. It is actually very close to the space station, but higher up so it appears distant.'