Scientists Detect "Last Gasp" of Spacetime After Cosmic Collision, Validating Einstein

• Scientists have detected "late-time gravitational wave tails," a faint echo after massive black hole collisions, through simulations.
• This discovery confirms Albert Einstein's 100-year-old prediction about spacetime curvature and how it relaxes after cosmic events.
• The "tails" are subtle, mixed-frequency sounds, much weaker than initial gravitational waves, providing clues about the universe's large-scale structure.
• Researchers used intense head-on black hole collision simulations to amplify the effect and observe these faint echoes for the first time.
• The findings will guide LIGO and LISA in searching for these tails in real data, aiding in understanding the universe's age and structure.

Why It Matters: Faint echoes from black hole collisions confirm Einstein's theory, offering new insights into spacetime and the universe.