- Feb 18, 2021
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Astronomers have worked out when most of the water on Earth probably formed and it's older than you think.
Deciphering what happened so long ago is not simple. “After all, we only have at hand the final products of the process,” say Ceccarelli and Fu.
Instead, they have studied the history of the Solar System by watching how other planetary systems are currently forming elsewhere in the galaxy....
It turns out there is a special piece of evidence that helps confirm that the water on Earth came from this interstellar process.
Primeval hydrogen is a mix of two isotopes. The first is ordinary hydrogen with a single proton as a nucleus, while the second is deuterium, which has a proton and neutron as its heart....
It turns out that our water does share this signature. ““Heavy over normal” water on Earth is about 10 times larger than the elemental D/H ratio in the Universe,” say Ceccarelli and Fu. “This is a very precise indication that at least part of the water that arrived to us formed in the original molecular cloud clump from which the Solar System was born.”
The researchers say this evidence suggests that up to 50 per cent of the water we drink today probably came from this process and was delivered to Earth via small bodies called planetesimals. But they go on to say that the exact way in which this happened is far from clear.
Nevertheless, it means that each time you take a sip of water, you are drinking from a 4.5 billion year-old font that dates back to the formation of the Solar System.
Cheers!