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Science · Space exploration · published 2026-09-03 · via ScienceDaily

Star Formation Decline Puzzles Scientists Despite Abundant Hydrogen

Star formation across the universe has dropped sharply over the last 4.5 billion years, yet neutral hydrogen remains plentiful. This paradox challenges current models of galaxy evolution and star birth.

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Over the past 4.5 billion years, the rate at which new stars ignite across the cosmos has seen a significant reduction. Yet, observations

Expanded detail and Context are AI-generated analysis; the linked article remains the authoritative source.
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This summary is AI-generated and original to Mobble; the linked article is the authoritative source. Original headline: “The Universe Has Plenty of Hydrogen. So Why Is Star Formation Collapsing?.” Browse more stories.