The first stars made a surprising amount of calcium. New doubts have been raised over how.

June 8, 2021
Some astrophysicists theorize that, by fusing their contents in a certain way and ending their lives in "faint supernovas," the earliest stars created a large abundance of calcium seen in today's stars — and likely in our bones. But a new study found that the foundation of this explanation is shakier than previously believed.
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