“Imagine two black holes that lived a long life together. At the end of their lives they are going around each other, crossing a thousand of kilometeres in a fraction of a second. As they do so they leave behind in their wake a ringing of space, an actual wave on space-time. Space squeezes and streches as it emanates out from these black holes banging on the universe.Those are the gravitational waves and are literally the sounds of space ringing and they will travel out from these black holes at the speed of light as they ring down and coalesce into one, spinning, quiet, black hole. If you were standing near enough, your ear would resonate with squeezing and streching of space, you would literally hear the sound. - The sound the universe makes | Ted” UniverseBlack Hole Author:Janna Levin
“What we see of the universe is vast. We know that the universe is something like 90 billion light-years across.” KnowsYearsLightUniverseBillionsLight Years Author:Janna Levin
