The sun has a life span of about ten billion years, and we’re already heading toward five billion years in That brings up an important question: What exactly is going to happen once the Sun reaches its limit?

Ok, here are 10 things that will happen once the sun dies:
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7. The Greenhouse Effect Will Become Extremely Effective
[caption width="612"]The shining sun (image: Getty Images)[/caption]One of the first things that will happen once the Sun exhausts its hydrogen is that it will brighten a lot. The brighter the Sun gets, the more of its energy the Earth will receive. The gases in our atmosphere—such as carbon dioxide, methane, and nitrous oxide—work like a blanket and already hold in heat from our star, allowing the planet to support life. With the Sun working overtime, these gases will hold in more of its energy. The Earth will become extremely hot, causing water all over the world to evaporate and create a dense cloud in the atmosphere. This cloud will protect the Earth’s surface from the Sun’s radiation for a while. After enough time, though, the heat will become too much, and the oceans will start boiling. At this point, it will be no longer possible for life to exist on Earth. If we’re not dead by then, we would certainly die from lack of water and excessive heat.

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6. The Sun Will Expand
[caption width="612"]The sun (image credit: Getty Images}[/caption]Not only will the Sun become much brighter, but it will also increase greatly in size. Once it uses up all of its fuel, it will move on to the next phase in its life cycle: the red giant phase. Even though it increases in size, the actual temperature of the red giant phase is lower, at just 2,000 to 3,000 degrees Celsius.[3] That may seem hot, but in comparison to the Sun’s usual surface temperature of roughly 5,000 to 9,000 degrees Celsius, it is definitely cooler.Although this is how the Sun’s demise will occur, it is not true for all stars. Smaller stars, known as red dwarfs, are so weak that they simply go out once they use up their fuel (though they last much longer than other stars). On the other hand, blue and white giants are so big that they’ll fuse heavier elements until they develop an iron core. After that, they go supernova.

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5. . . And Then It Will Shrink
[caption width="612"]The sun (image credit: Getty Images}[/caption]Over time, the Sun will continue to change. When it’s through fusing helium, it won’t be able to do the same with the carbon, and it will finally shrink to a white dwarf. This phase is much smaller than the size of the original Sun.White dwarfs have much less energy, but what they do have is longevity.These star remnants continue shining on for billions and billions of years, until at some point, far in the future, they turn into dead black dwarfs. It is impossible to know exactly how long this process will take, because astronomers currently believe that the universe isn’t even old enough yet for any black dwarfs to have formed!

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4. Life May Form In Other Places
[caption width="612"]Stars (Credit: Anastasiia Shavshyna)[/caption]Although life on Earth would be long gone by the time the Sun becomes a red giant, that doesn’t mean it won’t reappear elsewhere. Jupiter and Saturn are both large planets with many moons, which could be habitable.... READ FULL: https://thesmartcitizens.com/2020/01/02/beware-7-scary-things-that-will-happen-if-the-sun-dies/
Credit: https://thesmartcitizens.com/2020/01/02/beware-7-scary-things-that-will-happen-if-the-sun-dies/