Answer 1:
The sun will pretty much stay like it is now
for the next 4 billion years. Maybe it will get
a little brighter, but after about 4 billion
years from now, the sun will swell up and become
a red giant star. Eventually the sun will run
out of fuel and settle down to become a TINY
white dwarf star.
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Answer 2:
The sun is growing, very, very, slowly. This
is because the sun is slowly using up its supply
of hydrogen fuel in its core, and as this
happens the outer layers start burning their
hydrogen, which puffs them out.
The sun will not grow to the point where life
on Earth becomes impossible for about a billion
years yet. By that time, we should have found
plenty of other stars and planets to
colonize.
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