What is going to happen in the end of the world?

it's hard to guess the details but, jesus will come again and bring you to heaven. It probabliy won't even happen in our life time. But, than agian, it could.

For those of us who aren't Christian, the world will end in approximately 5 billion years. The sun, having run out of hydrogen gas to fuel its nuclear fusion, will lose its hold on its outer gaseous layers. These superheated gasses will expand outward and either engulf the earth, completely destroying it, or settle past Venus, making the earth molten once more. After this red giant phase, the sun will become a luminous ball of superheated iron known as a white dwarf, which would be incapable of sustaining life on earth.