The Boundary Between Black Holes & Neutron Stars - YouTube - PBS Space Time - astrophysics

Gravitational waves were predicted by Einstein's Theory of General Relativity.On 14 AUG 2024,a signal was received consistent with a gravitational wave traveling at the speed of light at the Hanford LIGO in Washington State,the Livingston LIGO in Louisiana,and the Virgo LIGO in Italy.A neutron star is what's left over after a supernova.About 1.5 Suns of matter is compressed into an area the size of a small city,making the gravity 100 billion times stronger than the gravity of Earth's surface.The signal was consistent with a neutron star being in close proximity to a black hole.*Presented and written by Dr.Matt O'Dowd,an Australian astrophysicist.

Gravitational Waves: Ripples In Space-Time - NASA Goddard - astrophysics

Notes by NASA Goddard:Gravitational waves are ripples in the fabric of spacetime.They are caused by some of the most violent and energetic events in the universe,including colliding black holes;merging neutron stars or white dwarf stars;the wobble of neutron stars that are not perfect spheres;and possibly even the remnants of gravitational radiation create by the birth of the universe.*Gravitational waves were predicted by Einstein's General Theory of Relativity,but weren't confirmed until 2017.The NASA/ESA Hubble Space Telescope was able to photograph the galactic source of the waves.This opens up a new era of multi-messenger astronomy.