If the sun were to suddenly be extinguished, the
planets in our solar system would become much
colder. The earth would almost instantaneously go
into an ice age.
Scientists believe that the
actual fate of the sun is that it will run out of
hydrogen in the core which it uses as fuel to
burn. When this happens some more hydrogen at the
surface will fuse causing the upper layers of the
sun's surface to expand. It will expand so
greatly that its radius will overcome the earth
vaporizing our planet. After this the sun may
begin to cool (lasting a few billion years) as
for the fate of other planets farther out than
earth, I am unsure.
And of course, there is
no reason for you to worry about the end of the
sun since the amount of hydrogen left to burn will
last for about another 10 billion years.
The sun would have to cool down before anything
would change. This would take a long time before
we would even notice - thousands of years, and
millions of years before the sun would genuinely
As this took place, the solar system
would freeze because of the loss of energy input.
Nonetheless, all of the planets, moons, asteroids,
comets, etc. in the solar system, would continue
moving as they have always done since the sun's
gravity is determined by its mass,which is not
affected by its being turned off.
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