Top 10 theories on how the world will come to an end

New Delhi: People have been predicting the end of the world for thousands of years. There are stories around that this world runs on yuga system , and as per lifecycle there are four yugas, now we are living in kalyug ,which is the last yuga of lifecycle on earth.Three others were Satyuga, Dwapar yuga, Treta yuga. Hindu texts say, every Yuga has an end after which the next yuga starts. Thus the end of Kalyuga has been predicted off and on several times, and most of the times the predictions have fallen flat in the face of scientific reasoning. Here we discuss 10 theories in currency about how the world will come to an end:Collision of an Asteroid with EarthThis has been the favorite of people for a long time and one that even scientists believe will eventually occur. However scientists deal in tens of millions of years and although they say that one is inevitable, they can't say when. NASA, European Space Agency guys, watch out. FloodsA flood of biblical proportions is envisaged by many. This they fear can come about because of global warming. As the frozen ends of the earth melt, the rising waters will drown our major cities and most of mankind with it.Invasion by aliensThis is possible any time (provided there are living alien beings existing in any part of the universe) but why is it immediately thought that the arrival of aliens will mean our destruction? The mere word alien indicates different from us and so maybe they do not possess our seemingly reckless destruction of living things.Gamma Ray burstsOne of these does have the potential to destroy our planet but scientists don't think that even one Gamma Ray burst has ever occurred in our Galaxy and so why now?Solar flaresThis too is also a potential planet killer but although scientists believe one is possible, they also believe it would probably only be big enough to take out our technology. Has this already happened once before in Earth's ancient past?Nuclear catastropheThis has been a possibility since day one when the nuclear bomb was invented and already there are enough nuclear weapons in existence to destroy the planet several times over.Earth spinning off its axisIt is because of, and how earth spins on its axis, that we exist and if this axis were to change, then Earth could be in trouble. Unfortunately it is possible for this to occur: A major earthquake or a gigantic volcano could, theoretically, trigger this occurrence.Super volcanoIt is estimated that Mount Toba, a super volcano, erupted 74,000 years ago and plunged the planet into an Ice Age that lasted for 1,000 years. Although there are 40 such volcanoes that once existed, that have now become extinct, there is still an active one in Yellowstone Park. Reversal of the polesTheories say, this has has happened in the past (of course, billions of years ago) and scientists say that it will again likely happen at some time in the near future. Biblical prophecyIf you wish to believe the prophecy of the Bible, then remember the question still is when. If the earth's destruction is to be by the hand of God, then he has any of the above tools to work with.