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Chemicals buried in rocks early in our planet's history offer more proof that meteorite strikes made life on Earth possible, experts say.
Researchers studied isotopes of Selenium - atoms of the element that have the same number of protons and electrons but different numbers of neutrons.
Identical - Isotope - Signatures - Rocks - Types
Identical isotope signatures were found in these rocks and in certain types of meteorites.
That suggests selenium, as well as large amounts of water and other building blocks for life, originated outside our own world.
Scientists - Theory - Panspermia - Life - Universe
Some scientists go further with the theory of Panspermia, which suggests life itself spread across universe in the form of bacteria hitchhiking on comets or meteorites.
Researchers from the Tübingen University’s isotope geochemistry group in Germany used a new technique to detect the selenium isotopes.
Research - Team - Samples - Mantle - Rocks
The research team took samples of mantle rocks, which have been brought to the surface by plate tectonic processes and remained unchanged since the formation of the Earth.
They measured that the isotope signature of the selenium in these rocks and found they matched meteorites from the edge of the solar system.
Calculations - Cent - Water - Earth - Today
According to their calculations, around 60 per cent of the water on Earth today comes from...
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