Sunday, February 14, 2016

gravity waves!!!

I've got plenty more tedious thinking out loud to do on utilitarianism, but there are more important things going on right now. Gravitational waves!!

This. Is. So. Cool.* And what an awesome time in space science: first we went to Pluto, then found pretty striking evidence for Planet 9, then SpaceX friggin landed a rocket, and now we can listen to black holes colliding.

I can't even count how many talks on LIGO I heard at Caltech, and after arriving seriously excited about the project being located right there, got completely bored by it after about one semester, because the entire project up until now has frankly been engineering, not astronomy.** (I mean, you should read about the engineering, because it is a mind-boggling achievement: they detected a vibration the width of one thousandth of a proton!! Do you have any idea how tiny a proton is? An atom the size of a football stadium would have a nucleus (containing the protons) about the size of a pea, and a single human hair is about a million atoms thick. I can't believe someone thought "yeah we can do that" let alone did it.) So I kinda forgot about it, like I did New Horizons, and then bam, Einstein's prediction was confirmed on its 100th anniversary.

And now the real astronomy is coming back into play, and somehow we're now able to know things like that two black holes 1.3 billion light years away collided and 3 solar masses worth of material was converted into gravitational waves, briefly emitting more energy than the rest of the visible universe combined, and 1.3 billion years later we managed to detect spacetime smoothing itself back out as the black holes stopped spinning and combined into a single stable unit. That's ridiculous.

The New Yorker article is pretty good if you don't want to watch the press conference. Or just read the paper.


*I used to be highly averse to acquiring information through videos and would never link to one, but with the new ability to increase the speed with two clicks in youtube, I relent, especially in this case because the press conference with the actual scientists is a much better source of information than journalists. It's definitely worth watching.

**Engineering is cool too, but I'm not interested in it automatically, only when excited knowledgeable people (i.e. Matt) tell me about it.

No comments: