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Earth's Water Didn't Come From Outer Space
sciencehabit writes "Where did Earth's oceans come from? Astronomers have long contended that icy comets and asteroids delivered the water for them during an epoch of heavy bombardment that ended about 3.9 billion years ago. But a new study suggests that Earth supplied its own water, leaching it from the rocks that formed the planet. The finding may help explain why life on Earth appeared so early, and it may indicate that other rocky worlds are also awash in vast seas."
Um ... By definition, no.
Guns don't kill people; Physics kills people! - John Lithgow as Dick Solomon on Third Rock From The Sun
Reading the conclusions of the fine article, I notice "...the more probable source for early water oceans [on Earth] is the collapse of the planet's steam atmosphere..." and "... these oceans may not persist over billions of years on smaller planets against the processes of atmospheric escape and continuing impact blow-off..."
It is a clue also that the title is about early oceans. This paper has nothing to do with the origin of Earth's present oceans but rather discusses early, pre-bombardment phase water and also more massive rocky planets.