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From a scientific perspective, the world will end.
Our Sun is a yellow, G2 V main sequence dwarf. Yellow dwarfs live
about 10 billion years (from zero-age main sequence to white dwarf
formation), and our Sun is already about 5 billion years old.
As the core runs out of hydrogen and then helium, the core will contact and the outer layers will expand, cool, and become less bright. It will become a red giant star.
As a red giant, scientists believe its diameter may extend well beyond the orbit of Venus, and even possibly beyond the orbit of Earth.
It will be pumping out a thousand times more energy, making Earth complete heated hell. The solar winds will become cyclones that will make radio communication impossible and perhaps evaporate the atmosphere altogether.
The good news is that by the time this happens the heat will warm up other planets that we couldn't possibly inhabit now, so everyone on Earth may have to relocate, assuming the planet has advanced to that level of technology.
Personally, I don't think mankind will be around though.
The earth has limited resources and eventually our population growth will do us in. Enough food and water will be a major problem going forward.
If not that, we have to worry about a catastrophic meteor strike that would send the entire planet and any survivors back to a planet of the apes lifestyle.
And when the earth's magnetic field next flips, we are going to experience chaos like never before seen on earth that will complete disrupt and possibly destroy the entire planet's electronic infrastructure.
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