Here are some big-if-true scientific claims that made headlines in 2023

From ancient cannibalism to stars made of dark matter, 2023 delivered several scientific claims that could shake up their fields — if they shape up to be true.

Spark of life

Early life on Earth may have gotten a boost from giant volcanic eruptions. A new look at debris from 10 eruptions millions of years ago suggests they contained a lot of nitrate that formed in the atmosphere (SN: 6/3/23, p. 7). The eruptions could have triggered fierce lightning that ripped apart molecular nitrogen, freeing nitrogen atoms to bond with other elements and form molecules useful to life — including nitrate. The same process may have happened billions of

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