Thursday, June 18, 2026

What Would Happen if the Sun Stopped? Part 4: Black Hole Sun

A total solar eclipse. If the Sun's fusion ever switched off, it would take tens of millions of years for its light to truly fade. Credit: NASA/Aubrey Gemignani (CC BY 2.0).

Switch off fusion and, for ten thousand years, nothing happens. Then the Sun begins a slow, strange death: shrinking, briefly brightening, and coasting on gravitational heat for tens of millions of years. And the neutrinos give the whole thing away in just eight minutes.



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