Origin of water in the terrestrial planets

  title={Origin of water in the terrestrial planets},
  author={Michael J. Drake},
  journal={Meteoritics \& Planetary Science},
  • M. Drake
  • Published 1 April 2005
  • Physics, Geology
  • Meteoritics & Planetary Science
Abstract— I examine the origin of water in the terrestrial planets. Late‐stage delivery of water from asteroidal and cometary sources appears to be ruled out by isotopic and molecular ratio considerations, unless either comets and asteroids currently sampled spectroscopically and by meteorites are unlike those falling to Earth 4.5 Ga ago, or our measurements are not representative of those bodies. However, the terrestrial planets were bathed in a gas of H, He, and O. The dominant gas phase… 

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