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Scientists determine two major "doomsdays": the Milky Way will be destroyed by a collision with the sun. Content source: Xinhuanet [June 12, 2012, 10:45] [American Fun Science Website reported on June 8] Title: Only two doomsdays of the universe are certain. Last week, scientists said that the inevitable collision of the Andromeda Galaxy and the Milky Way is one of the two doomsday prediction factors that we can be completely certain of. The other is the destruction of the sun. The final collision of these two galaxies was the result of the unstoppable gravitational influence of two super-heavy "universe islands". The mass of the Milky Way and the Andromeda Galaxy are both more than 1 trillion times that of the sun. Three hundred years ago, if Newton had had data on the masses and velocities of these two galaxies, he might have predicted their eventual collision. This collision is as inevitable as Newton's discovery of the apple falling from the tree. The sun still has 6 billion years to live. It will burn out in 6 billion years, turning the earth into a cold and barren land. This fate of the Sun can be extrapolated to the fate of every star in the universe. One hundred trillion years from now, the last star will burn out. Except for the two immutable events mentioned above, all other cosmic catastrophic events are only probable. The idea that a head-on galactic collision won't happen in the next 4 billion years is laughable, given that some people are still worried about the many predictions related to the 2012 Mayan "doomsday" theory. Theories of cosmic catastrophe floating around the Internet range from possible to unlikely to completely impossible. Statistically speaking, a killer asteroid should collide with our Earth in less than 100 million years. In the next 250 million years, a supernova very close to the earth may illuminate the earth. Chaos theory suggests that in billions of years the planets may become unstable in their orbits, and Earth may collide with Mars. However, by that time, the earth's oceans had already completely evaporated due to the hot sun. In addition, there are some extremely unlikely events, such as a passing star or a "wandering" black hole that will hit the sun. This possibility increases slightly during a collision between the Milky Way and the Andromeda Galaxy. After all, interstellar space is vast, so direct collisions of stars will not occur, although the instability of gravity is likely to cause galaxy dynamic chaos. However, the future advanced technological potential of our civilization should mitigate the worst consequences of these catastrophic events