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A gigantic object the size of a planet has appeared on astronomers screens lurking near Mercury, with UFO hunters around the world wondering whether it’s an alien ship.

The object appears from nowhere in a sequence of images of a coronal ejection from the Sun, taken by a Nasa telescope.

As the flare races past Mercury, a huge round object appears next to it – but Nasa scientists insist that the object is merely a result of the way the images are processed.

As was suspected, it's simply a digital processing artifact. To read more, click here.