How Will The World End

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How Will the World End?

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from Universe Today

In this short explainer video, Universe Today publisher Fraser Cain explores the end of the Earth. How will our planet die? It might actually stick around for a long, long time. http://www.universetoday.com/103351/how-will-the-world-end/ ------------- There is almost nothing that could completely destroy the earth. Follow your instincts and ignore anyone raising alarms about its imminent demise. Oh sure, there's a pile of events that could make life more difficult, and a laundry list of things that could wipe out all of humanity. Including: asteroid strikes, rising temperatures, or global plagues In order to actually destroy the Earth, you would need significantly more energy, and there just happens to be enough, a short 150 million kilometers away: the Sun. The Sun has been in the main sequence of its life for the last 4.5 billion years, converting hydrogen into helium. For stars this massive, that phase lasts for about 10 billion years, meaning we're only halfway through. When the Sun does finally run out of hydrogen to burn, it'll begin fusing helium into carbon, expanding outward in the process. It will become a cooler, larger, red giant star, consuming the orbits of Mercury and Venus. Scientists are still unsure if the red giant phase of the Sun will consume the Earth. If it does, the Earth's story ends there. It'll get caught up inside the Sun, and spiral inward to its demise. Death by red giant in 5.5 billion years. If the Sun doesn't consume the Earth then we'll have a long, cold future ahead of us. The Sun will shrink down to a white dwarf and begin cooling down to the background temperature of the Universe. The Earth and the rest of the surviving planets will continue orbiting the dying Sun for potentially trillions of years. If we're exceedingly lucky, the Sun will get too close to another star, and the gravitational interactions will capture Earth in orbit, giving our planet a second chance for life. If not, the Earth will continue following the dying Sun around and around the Milky Way for an incomprehensible amount of time. At this point, the main risk to the planet is a collision. Or maybe it'll spiral inward over vast periods of time to be destroyed by the Sun, or collide with another planet. Or perhaps the entire Solar System will slowly make its way into the supermassive black hole at the center of the Milky Way. One last possibility. Physicists think that protons - the building blocks of atoms - might eventually decay, becoming smaller particles and pure energy. After an undecillion years - a 1 followed by thirty-six (36) zeros - half of the Earth will have just melted away into energy. But if protons don't decay, the Earth could theoretically last forever. The bottom line, the Earth was built to last.