 Constraints from cosmo-chemistry  Live 26 Al and 60 Fe was present in the early SS  Allows only a few My from SN-injection to SS-inclusion  Isotopes – including the live ones – were initially homogeneously distributed  Shown by correlation 26 Al – 54 Cr  Bulk portions of the SS solids were subjected to thermal processing , which sublimated some solids, including the (silicate?) 'carrier' of 26 Al  Caused major heterogeneity of 26 Al
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