Where did Earth’s water come from? Not melted meteorites, according to scientists. Woods Hole Oceanographic Institution is part of a collaborative study, offering new insight into the extraterrestrial origins of our lakes, rivers, and oceans. Water makes up 71% of Earth’s surface, but no one
“We wanted to understand how our planet managed to get water because it’s not completely obvious,” Newcombe said. “Getting water and having surface oceans on a planet that is small and relatively near the sun is a challenge”
“The challenge of analyzing water in extremely dry materials is that any terrestrial water on the sample’s surface or inside the measuring instrument can easily be detected, tainting the results,” said co-author Conel Alexander, a scientist at theTo reduce contamination, researchers first baked their samples in a low-temperature vacuum oven to remove any surface water. Before the samples could be analyzed in the secondary ion mass spectrometer, the samples had to be dried out once again.
“We knew that plenty of outer solar system objects were differentiated, but it was sort of implicitly assumed that because they were from the outer solar system they must also contain a lot of water,” said WHOI’s Nielsen. “Our paper shows this is definitely not the case. As soon as meteorites melt, there is essentially no remaining water.”
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