You don't need alien asteroids, you just need a hydrogen-rich atmosphere and liquid hot magma
Magma is made up mainly of oxygen and molten silicon."The authors have demonstrated that early interactions between magma oceans and atmospheres represent a key ingredient in future models of how Earth was shaped," Raymond said.
The author's calculations show that interactions with atmospheric hydrogen could produce enough water to fill the current volume of our oceans three times over. In a statement coinciding with the publication, co-author Anat Shahar, staff scientist and deputy for Research Advancement Earth and Planets Laboratory at Carnegie Science, said the inspiration for the new model came from studies of planets forming outside the solar system.
"Exoplanet discoveries have given us a much greater appreciation of how common it is for just-formed planets to be surrounded by atmospheres that are rich in molecular hydrogen during their first several million years of growth. Eventually, these hydrogen envelopes dissipate, but they leave their fingerprints on the young planet’s composition," she said.
"This is just one possible explanation for our planet's evolution, but one that would establish an important link between Earth's formation history and the most common exoplanets that have been discovered orbiting distant stars, which are called Super-Earths and sub-Neptunes," Shahar said. ®
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