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Universal Big Bang Lithium Deficit Confirmed
An anonymous reader writes New observations of the star cluster Messier 54 show that it is just as deficient in lithium as our own galaxy, furthering a mystery about the element's big bang origins. "Most of the light chemical element lithium now present in the Universe was produced during the Big Bang, along with hydrogen and helium, but in much smaller quantities. Astronomers can calculate quite accurately how much lithium they expect to find in the early Universe, and from this work out how much they should see in old stars. But the numbers don't match — there is about three times less lithium in stars than expected. This mystery remains unsolved, despite several decades of work."
"Astronomers can calculate quite accurately how much lithium they expect to find in the early Universe," can they? How do they know it's accurate? What control values are they using?
It's not entirely semantic, either; it goes on to say, "But the numbers don't match."
So how is that "quite accurate"?
You're being a pedant.
Let me rephrase for you: Using our current model of the big bang, scientists come up with 3x as much lithium as is measured. Therefor the model likely needs adjusting or there is something about the post big-bang that we do not quite understand.
By accurate they mean this measurement directly contradicts the model. There is no way for an error in the calculation to account for the difference.