{"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 stars?","topic_ref":"3b29f7c24689f116d4e24a9b9965296a8a7d4d58f92b9ab5ac13f314c66ba629"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"e1c8151cae9d0e0f2110030737bb74970543d79627db445108af64023c66c941","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"1ab0746348fe588a9a02b690a56618ccb78ff40d988d19d5a43ab409e4bcc17f","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"l1Brf2_gML4OVLDG4fAiOacz25ylsVQATlm7vOZabTKxLnr7ID9tl8xJEdw3AevRqlcN5z1Um_GBXWvDIvVYBA"},"schema":"pubphys.envelope/1"},"record_hash":"e1c8151cae9d0e0f2110030737bb74970543d79627db445108af64023c66c941","leaf_index":1268}