Roland Pail from the Technical University of Munich talks about the MAGIC mission concept at ESA’s Living Planet Symposium, being held in Bonn Germany. This potential new mission would measure Earth’s gravity in detail to yield new information on the amount of water in oceans, ice sheets, glaciers, near-surface and – uniquely among all space sensing technology – also underground. Most importantly, it would measure how this water shifts over time, known as mass transport.