A study suggests much of the water originated in rocks from which Earth is built. AUDIE CORNISH, HOST: ... She says that source of water could have been farther out in the solar system, like maybe icy comets or water-rich asteroids that hit the newly formed Earth and watered it. This has long been the prevailing view
Scientists have long debated whether the Earth's water was here when the planet formed or whether it arrived later. A study suggests much of the water originated in rocks from which Earth is built.
