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Many things will happen in the universe between 1 and 5 billion years from now. To name a few:

The Milky Way (our galaxy) is on a collision course with the Andromeda Galaxy. The two spiral galaxies are said to collide in 3 billion years.

In about 4 or 5 billion years, the Sun will begin to run out of it's Hydrogen fuel, which it converts to Helium in a process called Nuclear Fusion. The Sun, it's hydrogen fuel exhausted, will begin burning it's Helium. As it does so, it will cool and swell, becoming a red giant. When the Sun enters its Red Giant stage, it will expand and engulf the orbits of Mercury, Venus, and possibly Earth and Mars.

Eventually, it will run out of Helium fuel to burn, and will 'die'. Its layers will be released in a 'sigh', and all that will remain of our Sun would be a white dwarf, and a possible nebula, or cloud of dust and gas that is the remnant of our former star. Perhaps even the ghosts of its former planets will orbit around it. After a few trillion years, the White Dwarf that would be left over would cool down, becoming a cold, dead "Black Dwarf" approximately the size of our Earth. Because the universe is estimated to be between 15-20 billion years old, there are no Black Dwarves at this time. There likely won't be any within our lifetimes, either.

There are too many variables to process (at least by any methods we possess at our current stage of evolution as a species) in order to have any idea as to what will happen in exactly four billion years.

There are some estimates, however. In four billion years, our sun will be about two to three billion years from dying out. The universe is expected to keep on expanding. And other forecasts have been made, as well.

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Q: What will happen to the human race in 2 billion years?
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