{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"1f85893dca0b3d97834cba6b233cf5336f30c100ce0239f7440be5789bc69661","created":"2026-10-03T07:18:02Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","ed5e485b3467dc65495dddf71ecabf6c985963ff241c7c94e99b47c98c1ea091"],"salt":"4c30671c237938c16a53cee70d8348fc0ebfbb00e616c1bedd2381d0180734e9","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"cosmo.lithium-problem.unprocessed-lithium","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"ed5e485b3467dc65495dddf71ecabf6c985963ff241c7c94e99b47c98c1ea091","relation":"special_case"}],"plain":"Measuring lithium in interstellar gas of a nearly pristine galaxy would avoid any doubt about stars destroying it. Such measurements are difficult because the lithium absorption line is very weak.","posed_since":"","precise":"Measure Li/H in the interstellar medium of a galaxy with metallicity below 0.1 solar, corrected for depletion onto dust and cosmic-ray production, with 20 percent precision. A 2012 measurement in the Small Magellanic Cloud gave a value consistent with BBN but with large errors and some galactic enrichment (moderate confidence on values).","problem_ref":null,"references":"","settled_by":"High-resolution ultraviolet and optical spectroscopy of Li I absorption toward bright stars or quasars behind low-metallicity gas with extremely large telescopes.","status_note":"","title":"What is the lithium abundance in gas never processed by 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