Scientific American has the article Black Holes, Cosmic Collisions and the Rippling of Spacetime.
Gravitational wave astronomy, where we view the Universe not in light or particles but by picking up the vibrations of spacetime itself, is a true revolution in our view of the cosmos. We can only guess at what it might show us as we continue to feel our way forward into the vast unknown.
If you want an explanation of the concept of spacetime, look at my previous post CERN scientists simplify space-time in 3 short videos. That should clear up any questions you might have. 🙂