Contrary to common assumption, not all meteorites from the outer solar system contain a lot of water.
. It might also aid in understanding the extraordinary circumstances that allowed Earth to become a planet that supports life.Although it is generally believed that water arrived on Earth from the outer solar system, it is still unknown what kind of objects could have transported it there.
Now, a team has examined seven melted meteorites, also known as achondrites, that struck Earth billions of years ago. These formed after shattering from at least five planetesimals- objects that collided to create the planets in our solar system today. A bubble near the top of the image shows water molecules attached to a rocky fragment, demonstrating the kind of object that could have carried water to Earth.They obtained some of their meteorite samples from the inner solar system, where Earth is situated and where the climate is typically believed to be warm and dry. Other rarer pieces came from our planetary system's colder, icier outermost regions.
This experiment was the first to measure the volatiles of these recently impacted meteorites. The group calculated the concentrations of silicon, calcium, iron, magnesium, and other elements using an electron microprobe. They then employed a secondary ion mass spectrometry device to determine how much water was in them.
"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 co-author Sune Nielsen in a"Our paper shows this is definitely not the case. As soon as meteorites melt, there is no remaining water."Researchers found that water comprised less than two-millionths of the mass of the achondrite meteorite samples.
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