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Title: What is the lithium abundance in gas never processed by stars?
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.
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).
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.
Kind: well-posed
Answer type: value
References: (empty)
Literature status: open
Status note: (empty)
Posed since: (empty)