DO YOU KNOW – 10
You must have read about LIGO, the world’s largest gravitational wave observatory. But do you know that LIGO is blind ?
Unlike optical or radio telescopes, LIGO cannot see electromagnetic radiation (e.g., visible light, radio waves, microwaves) nor does it have to because gravitational waves are not part of the electromagnetic spectrum.
In fact, electromagnetic radiation from space is so unimportant to LIGO that it is completely isolated and sheltered from the outside world.
LIGO cannot (nor does it need to) see anything. Rather, it ‘feels’ for invisible gravitational waves.
