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versions of the element with different atomic masses ? Two of the lead versions form when uranium isotopes radioactively decay; the other one is not a decay product.

This number is only a hair older than previous estimates of the solar system's age, which were chiefly gleaned from dating CAI's in other meteorites. As an example, Bouvier and Wadhwa cite the abundance of the isotope iron-60 in the proto-solar system.

This high quantity of iron can be traced back to the bellies of massive, short-lived stars, one of the only places in the universe where iron is produced.

When these stars explode as supernovae at the end of their lives, they would have seeded the ancient Solar System.

So if you push the age of the solar system back by about two million years, that means there was almost twice as much iron-60 present during its birth than previously thought.

And this increased concentration has consequences: it strongly supports the idea that a Michael was a science writer for the Idaho National Laboratory and has been an intern at Wired.com, The Salinas Californian newspaper, and the SLAC National Accelerator Laboratory. in evolutionary biology from the University of Sydney, Australia, a bachelor's degree from the University of Arizona, and a graduate certificate in science writing from the University of California, Santa Cruz.

The relatively small revision means that models of the gas and dust that gave rise to the Solar System should have around double the amount of a certain iron isotope, iron-60, than previously suggested."This suggests that one or more supernovae happened before the Sun's formation, explaining all these elements and their respective abundances," says Audrey Bouvier from the University of Arizona in Tempe, lead author of the study, published online in .The team's estimate helps to resolve differing results obtained by two dating techniques that astronomers use to assess the age of meteorites.These inclusions are considered as the earliest formed solids in the solar nebula.Their formation marks the beginning for several long- and short-lived radiogenic clocks that are used to precisely define the timescales of Solar System events, such as the formation and evolution of planetary bodiesmillion years ago.

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