SCIENTISTS COULD SOON 'HEAR' SOUND OF GRAVITY EVERYDAY.

Astronomers said in June 2017, they had felt space-time vibrations known as gravitational waves arising from the cosmic crash of two mammoth black holes three billion light years away, with two machines - one in Louisiana and the other in Washington - detecting remnants of that ripple passing through Earth on 04th January, 2017.
What are Black Holes? - A black hole is a region in space where the gravitational pull is so strong that not even light can escape it. A black hole swallows up everything too close, too slow or too small to fight its gravitational force.
Who came up with the idea? - The concept was first theorised by Albert Einstein in his Theory of General Relativity, though the scientist himself thought that it was something too bizarre to exist.
What is the significance? - 
  1. We can 'see' gravity now, unlike before, when we could only observe heavens by looking at light or various radiation.
  2. With Laser Interferometer Gravitational-Wave Observatory (LIGO), we could potentially be able to listen to gravitational waves emanating even from the Big Bang.
  3. Once LIGO becomes more sensitive, scientists hope to detect one black hole merger everyday. 
Keeping a tab on cosmic crashes: since when? - Astronomers started keeping watch on the cosmos in September 2015 with LIGO.
What is the latest occurrence? - In the latest LIGO event, which is the third such occurrence, a black hole 19 times the mass of the sun and another 31 times the sun's mass, married to make a single hole of 49 solar masses. During the last frantic moments of the merger, they were shedding more energy in the form of gravitational waves than all the stars in the observable universe. These waves were detected by LIGO.
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