What is the origin of water on Earth?

Led by Cédric Gillmann — Université libre de Bruxelles, ULB, funded by the EoS project ET-HoME, a team of researchers demonstrate that the water we are now enjoying on Earth has been there since its formation. Published on Nature Geoscience, this idea has very deep implications in terms of habitability of ancient Earth, Venus and Mars, as it suggests that planets likely formed with their near-full budget in water, and slowly lost it with time.