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Originally Posted by xelasnave
I was thinking total disappearance clearly ignoring the question however when the energy stops could we see the start of a gravitational colapse and maybe an explosion this may happen pretty fast
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Alex you are quite correct but our Sun is too small for a SN it would simply expand into a red giant when it ran out of fuel. This would take quite some time.
We have neutrino detectors at a few places around the Earth. These will tell you instantly when the Sun stops nuclear fusion as neutrinos escape from the Sun uninpeded by mere matter.
Bert