Gravitational waves are hard to detect because of their scale, speed and required precision. Some of the most precise lasers built are repeatedly bouncing ligh

Gravitational waves are hard to detect because of their scale, speed and required precision. Some of the most precise lasers built are repeatedly bouncing light over miles in a tunnel to track changes in arrival significantly less than a trillionth of a second different. Doing this while filtering out noise from miscalibrated sensors or just small vibrations outside the chamber is HARD, but improving. It gets better as more come online around the world to confirm detections and aid in better directional targeting.