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Apocalypse maybe: Nine ways the world could end

According to Norse legend, the world will end on Saturday February 22 2014. The gods will engage in a battle to the death and as a consequence earth will be swallowed into the sea. Life as we know it will cease to exist. Although this theory of impending doom should be taken with a pinch of salt, there are plenty of other catastrophic events that could push humanity to the brink of extinction. Black holes, asteroid impacts and even aliens could signal the end of Earth - decide for yourself which is the most likely outcome.