Chemical analysis of Martian meteorites supports the controversial theory of water on Mars, according to Meenakshi Wadhwa, PhD, associate curator of meteoritics at The Field Museum in Chicago. Her research was published in the February 23rd issue of Science. Last year, an analysis of images of Mars taken by NASA’s Mars Global Surveyor spacecraft revealed surprising evidence that the planet was once a watery place. On Earth, sedimentary rock is formed by deposition from water, and the photographs of Mars show hundreds of layers of sedimentation.