The early universe wasn’t nearly as pristine as scientists thought
New observations from the James Webb Space Telescope indicate that early galaxies were dispersing heavy elements like carbon and oxygen into space much sooner than previously thought. This challenges the long-held belief that the early universe remained pristine for a longer period.
Why it matters
This discovery reshapes our understanding of cosmic evolution and the timeline for the chemical enrichment necessary for the formation of planets and life.
Only about 500 million years after the Big Bang, when the universe was roughly 3% of its current age, some of the first stars and galaxies had already begun to shine. Astronomers have generally expected that much of the gas around these young galaxies would still have been nearly pristine, consisting mostly of hydrogen and helium, the basic elements that dominated the newborn cosmos.
New evidence suggests that picture may be incomplete. A study led by astronomers at the University of Arizona and published in Nature Astronomy indicates that early galaxies were already sending heavier elements such as carbon and oxygen into surrounding space much sooner than expected.
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