Besides the visible supernova blast, what other type of disturbance created by the collapse can be directly detected on Earth using instruments like LIGO?
Answer
Gravitational waves
The collapse process, especially when massive remnants merge, generates propagating disturbances in the curvature of spacetime known as gravitational waves, which instruments like LIGO and Virgo can detect, providing a direct signal of the energetic event.

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How the Collapse of Stars Produces Elements | BBC Earth Science
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