Cosmological lithium problem, an Uncommon card

The card carries these facts from its Wikipedia article.

• The Big Bang nucleosynthesis and WMAP constitute cosmic baryon density predictions of the cosmic microwave background, namely, the most widely accepted models of the Big Bang suggest that three times as much primordial lithium, in particular lithium-7, should exist.
• This contrasts with the observed abundance of isotopes of hydrogen and helium that are consistent with predictions.
• The discrepancy is highlighted in a so-called "Schramm plot", named in honor of astrophysicist David Schramm, which depicts these primordial abundances as a function of cosmic baryon content from standard BBN predictions.

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Cosmological lithium problem article was read about 17,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 70 and blocks with 66: each hit it takes is cut by 26 %.

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The cards just above and just below Cosmological lithium problem in the power ranking, all domains together.