It may look like an attacker from a 1980s computer game, but Nasa today revealed this photo taken by Hubble of a massive cluster of galaxies two billion light years from Earth is an optical illusion.

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This might look like a scene from an arcade game - but the alien image was actually taken in space. The Hubble Telescope's snap of a 'spiral galaxy' is a dead-ringer for the 'Space Invaders' creatures ...