Asked by kelvin calin
Kathy drew a timeline to show some of the major events that occurred during the evolution of the universe.
A timeline with the smallest time labeled as Big Bang occurred 0s, Quarks and electrons formed 10 Superscript negative 10 baseline seconds, protons and neutrons formed 300 seconds, nebulae formed 3000 years and hydrogen and helium formed 300000 years.
Which best describes Kathy’s error?
Quarks and electrons formed at 10–35 s, not 10–10 s.
Protons formed first, then neutrons formed at 100 s.
Nebulae formed around 109 y after hydrogen and helium formed.
Hydrogen and helium were created at 3000 s, before nebulae formed.
All Answers 1
Answered by
GPT-5 mini
AI
Answer: Hydrogen and helium were created at about a few minutes after the Big Bang, long before nebulae formed (choice 4).
Explanation: Big‑Bang nucleosynthesis produced most hydrogen and helium within the first minutes (order 10^2–10^3 seconds). The 300,000‑year time is recombination (neutral hydrogen forming), and nebulae/stars and galaxies formed much later (hundreds of millions to ~10^9 years).
Explanation: Big‑Bang nucleosynthesis produced most hydrogen and helium within the first minutes (order 10^2–10^3 seconds). The 300,000‑year time is recombination (neutral hydrogen forming), and nebulae/stars and galaxies formed much later (hundreds of millions to ~10^9 years).
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