Star Formation Decline Outpaces Drop in Neutral Hydrogen

Combining data from China's FAST telescope and DESI observations of 2.5 million galaxies, researchers found that star formation has fallen by a factor of 2.5 over the last 4.5 billion years, while neutral atomic hydrogen only decreased by 1.4 times. This discrepancy suggests that factors other than raw fuel availability are driving the collapse in stellar birth rates.
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Original headline: “The Universe Has Plenty of Hydrogen. So Why Is Star Formation Collapsing?.” Browse more stories.