Astronomy Chapter 23 Ranking Task

Shown following are the names of several eras that are used to descried the history of the universe. Rank the eras from left to right in the order in which they occurred from first to last.
1. era of nucleosynthesis – fusion created helium nuclei
2. particle era – protons, neutrons both common
3. era of nuclei – H, He nuclei and electrons existed, but no neutral atoms
4. era of atoms – neutral atoms existed, but not stars
5. era of galaxies – stars and galaxies common
6. Planck era – all 4 forces operated as one
7.electroweak era – 3 forces operated: gravity, strong, electroweak
8. GUT era – strong, electroweak forces unite as GUT force
From first to last: Planck era, GUT era, electroweak era, particle era, era of nucleosynthesis, era of nuclei, era of atoms, era of galaxies
Shown following are the same eras shown in Part A. Rank the eras from left to right based on the temperature of the universe during each one from coolest to hottest.
Coolest to hottest: era of galaxies, era of atoms, era of nuclei, era of nucleosynthesis, particle era, electroweak era, GUT era, Planck era
Shown following are the same eras shown in Parts A and B. Rank the eras from the left to right based on the size of the observable universe during each one from smallest to largest.
Smallest to largest: Planck era, GUT era, electroweak era, particle era, era of nucleosynthesis, era of nuclei, era of atoms, era of galaxies.
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