Let's say we have two black holes, one 20 solar masses and the other 50 solar masses, and they get close enough and merge. In the process, they convert a solar mass or two into gravitational waves, which radiate off into the distance. Let me restate that, to emphasize what I think is really we...
Source: [Hacker News](https://news.ycombinator.com/item?id=49109277)