The latest astrophysical news is that it's a whole bizarro solar system in fact, blown into counterintuitive existence by an ultra-massive supernova explosion that waffle-stomped the pre-solar nebula out of interstellar gas with a shock wave blow-off rich in radioactive Aluminum 26.
Then a million years later came the grand finale- the detonation of the still-massive dying star's core in a blaze of neutron-enriched iron 60. It happens rarely, and only in the gnarliest stellar neighborhoods, like the distant Eagle Nebula, above , leaving them scarred with weirdly legible isotopic graffiti forever.
That's the meteorite geochemistry skinny just published in Science , and the lead author is, who else , Martin Bizzarro, whose vocation was clearly written in the stars long before the war against cliche' began , let alone was lost -
Evidence for a Late Supernova Injection of 60Fe into the Protoplanetary Disk
Martin Bizzarro, David Ulfbeck, Anne Trinquier, et al.
High-precision 60Fe-60Ni isotope data show that most meteorites originating from differentiated planetesimals that accreted within 1 million years of the solar system's formation have 60Ni/58Ni ratios that are 25 parts per million lower than samples from Earth, Mars, and chondrite parent bodies. This difference indicates that the oldest solar system planetesimals formed in the absence of 60Fe.
Evidence for live 60Fe in younger objects suggests that 60Fe was injected into the protoplanetary disk 1 million years after solar system formation, when 26Al was already homogeneously distributed. Decoupling the first appearance of 26Al and 60Fe constrains the environment where the Sun's formation could have taken place, indicating that it occurred in a dense stellar cluster in association with numerous massive stars.
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