What non-radiant output is produced when a star undergoes significant structural changes like a core collapse?

Answer

Gravitational waves, which ripple spacetime itself.

While steady energy release involves radiation, abrupt changes in stellar structure, such as a core collapse or the merging of stellar objects, create ripples in spacetime known as gravitational waves.

What non-radiant output is produced when a star undergoes significant structural changes like a core collapse?
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