5. Religious Apocalypse - or rapture, or "judgement day". Most religions predict such a day. Conspiracy theorists suggest that many world leaders have apocalyptic beliefs, and may even be attempting to cause Biblical prophecy to be fulfilled in 2012 via their actions. If it helps, the Bible says “But of that day and hour knoweth no one, not even the angels of heaven, neither the Son, but the Father only.” But then again, maybe God changed his mind since the Bible was written, and told some people the date of the apocalypse? Maybe he told the ancient Mayans? Possibilities could be argued ad infinitum
4. Explosion from the black hole at the center of our galaxy - in 1983 Dr Paul LaViolette described the dangers of a Galactic core explosion. He explained that it would generate a cosmic ray superwave, and it would be signalled by a gamma ray burst (see below). He also warned us that a gravity wave might travel ahead of the superwave. If seems likely that the 2004 tsunami was caused by a gravity wave, because the accompanying GRB arrived just 21 hours later, and was the brightest ever observed, 100 times brighter than any other seen in recorded history. This gravity wave did not come from our galactic center, but if it had, perhaps the effects would have been much worse.
3. Magnetic Pole Shift - pole reversals have been happening on average once every 400,000 years, with the most recent one being 730,000 years ago - so we are well overdue. Not only do we not know much about reversals, scientists are still unsure about how our magnetic field is generated. Long thought to be a by-product of the movements of liquid iron in our planet's core, recent studies are suggesting that our salty oceans might be the cause. Scientists suggest a geomagnetic reversal takes thousands of years and does no harm. They are wrong - it could just as easily happen overnight. No mechanism is known for the cause of the magnetic poles swapping places. Our magnetic field is known to be rapidly declining (10% in the last 150 years), and the magnetic North pole is moving around at an accelerating pace - it has been predicted it will move from Canada to Siberia in the next 50 years. These changes could be indicating an imminent reversal.
2. Coronal Mass Ejection (CME) from our Sun - a CME was behind the solar storm of 1859. It occurred in September of that year, causing the failure of telegraph systems across North America and Europe. Accompanying the storm were auroras that are normally only seen in the Arctic and Antarctic, but were visible as far south as the Caribbean. Typically we would expect a storm of 1859's magnitude cause power blackouts and wreck satellites. But do we really know how big they can get? In 2009 NASA told us to be wary of solar storms, and warned of the dangers to America's ancient overloaded power grid. Being without power for a few months, in the developed world, is a lot more serious than most people realise.
1. Asteroid/Meteor/Comet - ancient, advanced civilisations have one distinct advantage over us - they may have observed the skies for longer, and may have spotted an orbit that will culminate in a collision with Earth in 2012. This is easily the most predictable disaster for 2012. With recent discussion of "dark comets", we have become aware of the possibility of our planet being struck with little or no warning. Read the full article on Comets and Asteroids
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