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This intriguing footage captured by NASA shows a 'UFO' hovering near the International Space Station as two astronauts conduct a spacewalk.

In the five-minute clip, posted to YouTube, NASA astronaut Reid Wiseman and Alexander Gerst, from the European Space Agency, are seen on the spacewalk.

The pair, clad in spacesuits, step outside the carry out a series of repairs.

However, for around five seconds, a mystery craft - which is presumably hovering or flying in - is also visible in the background, in the pitch black.

It appears in the camera frame between the space station and Earth - an area filled with just blackness only a few seconds eariler.

Unsurprisingly, NASA has yet to comment on the puzzling object.

But the agency has confirmed that the spacewalk, which took place on Tuesday October 7, saw the two astronauts completing tasks for the Expedition 41 crew.

The duo moved a broken cooling pump into an external storage space.

In addition, they installed gear that provides back up power for the external robotic arm and the 'rail-car' system it uses to move along the length of the station.

A second spacewalk is scheduled to take place today, NASA said.

The purpose is to replace a failed voltage regulator and to move camera equipment in preparation of next year's arrival of new docking adapters for crew vehicles.

The clip, uploaded by NASA, has been viewed 28,000 times.