It depends on the definition of ‘end of the world’ 🙂 If this is a reference to Apocalypse-style event which happens rapidly and cannot be avoided or prevented via human agency — then we can expect total extinction of higher life forms (and possibly all life if things get bad enough) and then the planet (should it survive intact) will have a chance to re-start from scratch, more or less. If the end of the world refers to the inevitable (but very far away!) demise of our Solar system – well, I hope that by then humanity (or whatever we evolve into) has figured out a way to propagate ourselves away from just one star system, so that we can carry on. If you refer to the end of the Universe – then what happens ‘after’ that is unclear in the same way that it’s unclear what happened before the Big Bang 🙂
Our world will probably end by the sun ending.. and hopefully not by us having a nuclear war or zombie apocalypse lol
About 1.1 billion years from now as the sun reaches the end of its life, it will begin to grow larger and hotter. The earth’s ice caps will melt and, as the planet grows hotter, the oceans will boil away. Eventually Earth will lose all its water to space. It will be a hot, dry planet. All life will end at this point, but not bacteria, they always find a way to survive in extreme conditions such as on volcanoes in space etc.
3.5 billion years from now, as the sun steadily grows larger and hotter, the earth will resemble the inferno of today’s Venus.
As the ever-growing sun becomes a huge orange giant star, dominating the sky, the surface of Earth will glow with a red heat and mountains will begin to melt. A bloated red giant sun will engulf the orbits of Mercury and Venus. Its tenuous outer atmosphere may even reach the orbit of the earth.
Roughly 12.4 billion years from now, the sun has blown off its outer layers. All that is now left of our star is a white-hot dwarf probably not much larger than the planet Earth had been. The Earth will remains as a burned-out, lifeless cinder that is the corpse of our world.