What ended the 'Cosmic Dark Age'? Astronomers say they're closer than ever to an answer.
Astronomers are closer to understanding what ended the 'Cosmic Dark Age', a period when the universe was a dense fog of hydrogen. New observations suggest that young massive stars, not supernovae, likely reionized the early universe, allowing ionizing light to escape and clear the fog. This challenges previous theories that powerful winds from exploding stars helped radiation escape galaxies.
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- ✓ The universe was a very dark place about 400,000 years after the Big Bang.
- ✓ The first stars formed from clumps of gas drawn together by gravity.
- ✓ Young massive stars likely reionized the early universe.
- ✓ Supernovae may have restrained, rather than helped, the escape of ionizing radiation.
What changed
Recent studies, including one published in Nature Astronomy, suggest that newborn stars, not supernova winds, let ionizing light escape during the universe's reionization, recasting the role of supernovae in ending the Cosmic Dark Age.
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Astronomers closer to answer on what ended the 'Cosmic Dark Age'
Astronomers are closer to understanding what ended the 'Cosmic Dark Age', a period when the universe was a dense fog of hydrogen. New observations suggest that young massive stars, not supernovae, likely reionized the early universe, allowing ionizing light to escape and clear the fog. This challenges previous theories that powerful winds from exploding stars helped radiation escape galaxies.
Why it matters
The 'Cosmic Dark Age' occurred about 400,000 years after the Big Bang, when the universe was still a very dark place. The period ended when the first stars formed and produced enough light to burn away the fog by 'reionising' the gas, creating the transparent universe we see today. Understanding this transition helps scientists learn about the early universe's evolution.
What is confirmed
- The universe was a very dark place about 400,000 years after the Big Bang.
- The first stars formed from clumps of gas drawn together by gravity.
- Young massive stars likely reionized the early universe.
- Supernovae may have restrained, rather than helped, the escape of ionizing radiation.
Still unconfirmed
- Supernovae may have played a lesser role in reionizing the early universe.
What to watch next
- Further analysis of data from the Hubble Space Telescope and other observations
- Publication of more detailed studies on the role of young stars and supernovae in reionization
confidence 85%Sources used for this update (10)
- www.thetimes.com.au — What ended the ‘dark ages’ in the early universe? New Webb ...
- Live Science — What ended the 'Cosmic Dark Age'? Astronomers say they're closer than ever to an answer.
- Science Daily — Hubble reveals a stunning twist in how the universe emerged from darkness
- ua.news — Supernovae may have restrained the escape of ionizing radiation — Live Science
- Around Prague — Dying Stars May Have Slowed, Not Sped Up, the Clearing of the Early Universe’s Fog
- www.sciencedaily.com — Hubble reveals a stunning twist in how the universe emerged ...
- www.yahoo.com — What ended the 'Cosmic Dark Age'? Astronomers say they're ...
- scienceglobal.academy — Astronomers may have been wrong about what ended the 'Cosmic ...
- theprimary.com — Young stars may have ended the cosmic dark age before ...
- israel-chronicle.com — Study Recasts Supernovas’ Role in Ending the Cosmic Dark Age
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