[Urdu/Hindi] The Background Hum of Gravitational Waves

Gravitational waves were predicted by Einstein's General Theory of Relativity. They were first directly detected in 2015 with LIGO and those were mostly the result of the collision of two star-size black holes. But now in a fascinating way, astronomers have used pulsars (spinning neutron stars) to detect a background hum of gravitational waves, probably caused by supermassive black holes. Please join astrophysicist Salman Hameed in exploring the topic of gravitational waves and how astronomers used dead stars to make the new detection in this Urdu/Hindi audio. For full video: https://youtu.be/PTqG9ptEM1Q