A YouTube user claims he has found proof that NASA is covering up evidence of aliens because the agency's spacecraft that monitors the Sun went offline after he spotted a 'UFO' on its video feed.

On May 5, user 'rob19791' posted a YouTube video of a mysterious-looking 'object' hovering near the sun. The footage was taken from video that the Solar and Heliospheric Observatory beamed back to Earth and streamed online.

But the claims are likely to fall on deaf ears at NASA after two other similar sightings of 'alien spaceships' have been debunked with simple explanations.

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