This image recreates the reddened Sun over the lifeless Earth.
One day our planet will die. The death of the Earth could be caused by several causes, such as the collision with a large object or deviating from its orbit. Kepler believed in this last possibility, although today we know that it is practically impossible. In the best case, the Earth will die when the Sun has consumed all its fuel and becomes a red giant.
Within a billion years, the Sun will begin to expand and heat more strongly. Life will become increasingly difficult and eventually disappear. The last survivors on Earth will be the extremophiles, microorganisms capable of withstanding extreme conditions.
In 1.4 billion years, the oceans will have evaporated. The heat "will break" the water vapor molecules (H2O) accumulated in the atmosphere. Hydrogen, very light, will escape into space. Oxygen will make the atmosphere very dense and create superstorms. The radiation will not be able to escape, the greenhouse effect will increase and the Earth will heat up faster and faster. Its surface will melt.
Within 7.5 billion years, the Sun will have become a red giant. It will have grown so much that it will occupy the whole sky. It will begin to engulf the planets. The death of the Earth will be inevitable. It will melt and become part of the Sun. Shortly after, the Sun will also die.
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