William Rapin is a CNRS Research Scientist at IRAP (Research Institute in Astrophysics and Planetology) in Toulouse, France, collaborating with IMPMC (Institute of Mineralogy, Materials Physics and Cosmochemistry) in Paris, France. His research investigates the surface geochemistry of planets to improve our understanding of their origin, evolution, and habitability. Rapin of the Research Institute in Astrophysics and Planetology (IRAP) in Toulouse, France, sheds more light on climate changes that occured on Mars. By analyzing the data from NASA’s Curiosity rover, he found how climate on the Red Planet alternated between dry and wetter periods, before drying up completely about 3 billion years ago.