The Absurdity of Detecting Gravitational Waves

There are many good videos on youtube that do a good job explaining what gravitational waves are and how we detect them. Many of these were made in response to the first detection, and they do a pretty good job explaining it in laymans terms. I personally really like veritasiums video here. [VIDEO]

Except imagine you're embedded on the string itself and cannot actually sense the string "moving through space". The way you have to measure it is by sensing tiny changes in distance between the left and right side of the string as it wiggles around. The actual detail of the experiment and the precision they reach is quite fascinating. Veratisium has a pretty good video explaining it in more laymen terms [0] [0] [VIDEO]

Here is a great video with explanations: [VIDEO] Short answer - they use lots of techniques - its super hard.

From my understanding as a layperson, using other LIGO style detectors to substitute the z-axis won’t work. You need to shoot laser pulses continuously and in sync into two axes from the same detector to be able to detect ripples in spacetime. The sensitivity of two non-connected detectors working together is not high enough. See [1] for how the detection works. [1] [VIDEO]

I figured that one tube is stretched by the gravitational waves and the perpendicular tube is unaffected, so you're measuring the difference between the two tubes. Simple and easy to understand. However, the video mentioned that both light and the detection apparatus are stretched by the same degree and the physicist says "the light does get stretched and that part doesn't do the measurement for us"[1] -- which makes me think that the simple and easy explanation is not quite right. There's some subtlety that I think I'm missing. [1] [VIDEO] (6min 16sec into the video)

You don't have to watch his channel for very long to learn that he often does (see his video about the recent gravitational wave detection [1], plus a bunch more). [1] [VIDEO]