God gets angry with us and switches off the sun, replacing it with non-luminous incompressible matter in a process that starts at the center of the sun and proceeds outward at the speed of light. assuming the sun is a sphere, the transformation process reaches all points of the sun's surface simultaneously. but what do we see on Earth in the sun's final moments?
sunradius/c = 2.3 seconds.
the middle of the sun's disc is closest to earth, so it turns black first.
photosphere has depth. limb darkening. assume the non-luminous incompressible matter has the same transparency has the solar matter it replaces.
more complicated: the non-luminous matter is not magically incompressible. maybe it is iron. without radiation pressure from fusion to support itself against gravity, what happens to the sun? probably rapid collapse into a white dwarf, something that never happens naturally. how violent would such a collapse be? is it similar to a supernova? do interesting things happen within 2.3 seconds?
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