The ESA LISA Pathfinder is a test platform testing technologies for a space based gravity wave detector. Everything worked better than expected. This, along with the successes of LIGO, suggest that we have new ways to observe the universe. Our second link below by NASA fills in some details and pushes our amazement further. We can do great things.
LISA Pathfinder: Another big step forward [link]
NASA on LISA [link]