Is the universe an opinion

Astrophysics: When Will the Universe Perish?

The only 13.7 billion year old universe will produce many new stars, galaxies, planets and possibly also new forms of life in the next trillions of years. But at least the era of earthly life is coming to an end comparatively soon. The processes that take place inside a star are well understood. Physicists can therefore predict that our sun will shine ten percent brighter than today in a billion years. That's enough for the ultimate climate catastrophe. The temperatures will then average 50 degrees Celsius.

Optimists may argue that the technologies available by then can also enable survival in the hypergreenhouse. But even if that were the case, it would only mean postponement. In a few billion years at the latest, the sun's hydrogen reserves will run out. Before the end of her life, however, she will inflate herself again enormously, first swallowing the planet Mercury, then Venus and finally also the earth. Long before that, the merciless rays of the sun will have evaporated all the water in the oceans. The earth is transformed into a sterile rocky planet, the surface of which, beginning with a ring of fire around the equator, finally turns entirely into glowing lava. The story of biological evolution on earth ends here at the latest.

Another cosmic event is likely to take care of the extinction of more highly developed forms of life much earlier. There is a high probability that the Earth will be hit by a giant asteroid in the next or a few hundred thousand years, causing a global catastrophe - similar to the one that led to the extinction of dinosaurs around 65 million years ago. Lower life forms, especially those that get by in the depths of the oceans without the light of the sun, could, however, survive such a hit from space.

This would also apply to a scenario that is very unlikely, but possible: the earth being thrown out by a star passing nearby, such as a so-called brown dwarf that does not shine itself. As a result, the earth would escape the glow of the sun, but would die in the darkness of space to death. The oceans would freeze to ice for kilometers, liquid nitrogen and oxygen would rain from the atmosphere, and primitive earthly life would only be conceivable in the depths of the oceans, where the warmth coming from inside the earth could serve as a source of energy for a long time to come. But who could be interested in this then?