Gravitational waves explained

A very good video about explanation of gravitational waves

https://www.youtube.com/watch?v=4GbWfNHtHRg

What are gravitational waves?

Colossal cosmic collisions and stellar explosions can rattle spacetime itself. Relativity rule predicts that ripples in the fabric of space-time radiate energy . After some time, they reach Earth, compress spacetime by as little as one ten-thousandth, the width of a proton.

How are they detected?

To spot a signal, LIGO uses a special mirror to split a beam of laser light and sends it down two 4-kilometer-long arms, at a 90 degree angle to each other. After ricocheting back and forth 400 times, turning each beam’s journey into a 1,600 kilometer round-trip, the light recombines near its source.

Capture d’écran 2016-02-20 à 10.56.33

 

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