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2015: LIGO’s Discovery of Gravitational Waves – Echoes of Colliding Black Holes

In 2015, humanity heard the universe in a completely new way. The Laser Interferometer Gravitational-Wave Observatory (LIGO) detected faint ripples in spacetime, known as gravitational waves, caused by the collision of two massive black holes over a billion light-years away. This was the first direct confirmation of a phenomenon predicted by Einstein’s general relativity a century earlier.

The signal, lasting just fractions of a second, carried information about the masses, spin, and energy of the black holes involved, revealing a cosmic cataclysm of unimaginable power. It marked the birth of a new era in astronomy, where scientists could observe the universe not only with light, but through the very fabric of spacetime itself.

LIGO’s discovery opened a window into phenomena previously hidden from view — merging black holes, neutron star collisions, and potentially even echoes from the earliest moments after the Big Bang. It transformed our understanding of the cosmos, proving that the universe is not silent, but filled with the resonant echoes of its most violent events.



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