The Final Orbit Before Two Black Holes Merge—When Spacetime Screams | Space Documentary

Two black holes can orbit each other for millions of years—but their final moments unfold in less than a second.

As the black holes spiral closer, they lose enormous amounts of orbital energy through gravitational waves. Their velocity rises, spacetime becomes violently distorted and the boundary between two separate objects begins to disappear. During the merger, more energy can briefly emerge as gravitational radiation than all the stars in the observable universe produce as light.

But what happens during the final orbit? Do the event horizons collide, merge or transform into something entirely new? And how can instruments on Earth detect an event producing no visible light?

This space documentary follows a binary black hole through its final inspiral, merger and ringdown—revealing how Einstein’s general relativity describes one of the most powerful events in the universe.

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