It is a map the like of which you have probably never seen before. The sweep of colours shows minute variations in the Earth's gravitational field. If you were to fly over the red areas, you would be tugged ever so slightly downwards; the blues mark regions where the planet's attraction is much weaker. These gravity anomalies, as they are known, are imperceptible to the human senses, and so the scientists have wrapped the data on to a sphere and exaggerated the highs and lows. This gives us a stunning visual representation of the subject under study. It might look a bit odd - but don't be fooled by this "virtual potato". The map and the others that will follow it are going to give extraordinary new insights into how the oceans move and influence the climate. Understanding precisely how greenhouse warming could change our planet will depend on these bumps and pimples. The map has been produced by the US-German Gravity Recovery and Climate Experiment (Grace) mission. This model is the first full science product to come out of the mission which gathers its data from two spacecraft orbiting more than 450 kilometres above the Earth.