In our second hour, we looked at the actual setup of the experiment that detected the gravitational waves, and we revisited some of the material we covered last year when Jared took Astronomy. The current detectors (LIGO, one in Virginia, one in Washington) operate on the same principle as the Michelson-Morley experiment, when those two physicists were the first to attempt to measure the speed of light. We also covered the formation of black holes of different masses - to get a black hole of some 20-30 times the mass of the Sun as are those thought to have produced this burst of gravitational waves, the precursor star would have to be some 100 times the mass of the Sun, and would produce the remnant black hole through a 'hypernova' explosion. I then obtained a PDF file of Kip S. Thorne's peer-reviewed paper for Jared to read on the mathematics behind the graphics for the movie 'Interstellar', in which the black hole, Gargantua, is, in fact, mathematically correctly reproduced. Jared was super concentrated throughout our lessons today, and I look forward to getting back to the curriculum on Tuesday.