The Importance of Laser Interferometers

The state of the art in terms of gravitational wave detection are these really enormous laser interferometers like this experiment called LIGO. These aren't something you can fit in your basement, they have four kilometer routes one way before they're reversed and the lasers come back together. In 2015 on September 14th of that year, they observed the first gravitational wave from a merger of two black holes that took place about 1.3 billion light years away. And since then, we've now got a list of about 15 confirmed gravitational wave events.