The once in a million year flypast of Mars: Nasa prepares to observe close encounter with 'dawn of man' comet as it passes just 87,000 miles from the red planet on Sunday

Comet Siding Spring, will pass within about 87,000 miles (139,500 kilometers) of the red planet Researchers hope to capture first image of a comet from another planet Will provide an unprecedented opportunity for researchers to gather data Siding Spring comes from the Oort Cloud, material left over from the formation of the solar system Spacecraft will collect in a 'duck and cover' move to avoid hitting comet