Scientists have spent ages searching for gravity waves from the safety of Earth, but they haven't had the chance to study those waves in space, where they could help make sense of black holes and other objects that distort spacetime. They're one step closer to getting that shot, though. The European Space Agency is almost ready to launch a vehicle, LISA Pathfinder, that will demonstrate the viability of measuring gravity waves in space. When it begins testing in March, Pathfinder won't actually measure gravitational effects at all. It'll instead look for extremely minute (picometer-level) changes between two test masses within the spacecraft, proving that you can achieve the extreme level of precision needed for a gravity wave detector.