From StarTalk.

Gravitational waves can distort space and time, but their effects on humans are imperceptible unless the source event is catastrophic—by which point, it would already be too late to notice. The nature of time and simultaneity is relative, and the concept of "now" loses meaning at cosmic scales.

From ‘Answering Questions about Hubble Tension, Dyson Spheres, & Relativity’: https://youtu.be/y8b93R3kfso?si=00o3TaIY9RJifycM

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