Detecting Gravitational Waves

These are all electromagnetic radiations, but different events in nature create them. The wave lengths crest o crest of these gravitational waves, thousands of miles long. Those are the ones that we are detecting. We do this, we detect them using our terrestrial detectors,. You've heard of ligo? That's one of our famous terrestrial detectors. They're creating huge millions to billions of miles long a wave lengths. Can we go any bigger? Ok, how about trillions of miles? These are created by some of the biggest things that can happen in the universe: supermassive black hole merges. And when galaxies collide, they will eventually settle down together for quite a time and get closer and faster