Lawrence Livermore Lab folk says Earth/Luna formed prior to water based on Stontium-87 quantities in both objects. So water happened to Earth after it was formed.
The large bodies that collided to form Earth/Luna “…must have both come from the inner Solar System, and the event could not have happened prior to 4.45 billion years ago, greatly reducing the formation window of the moon.”
Just in time for the water event for Mars! And likely Earth!
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