Gravitational waves: the media has been clamoring about the recent discovery and importance of these phenomena, saying that their discovery is the breakthrough of the century. But what exactly are these waves, and why are they so important?
To better understand these waves, we have to first start with the Big Bang–– the start of our universe. First, the universe was a singularity, which had an infinite density and contained all the mass and spacetime of the universe. Then, suddenly, rapid expansion took place. The temperature and density were both very high at first, but the universe soon started to rapidly cool off while it expanded. But, the very first few moments of the Big Bang are more complicated though. What happened then?