NASA: New Mars Gravity Map Is the Best Ever

A new map of Mars' gravity, which NASA is touting as the best one ever made, will make it easier for future spacecraft to make their way to the Red Planet. The new map of Mars' gravity was generated by scientists using data from three NASA spacecraft — the Mars Global Surveyor, Mars Odyssey and Mars Reconnaissance Orbiter —which mapped the Red Planet from orbit. The data allowed NASA to create a video look at Mars' gravity, as well.