Eras of Early Universe
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Define Planck Era.
The time from 0 to 10^-43 seconds after the Big Bang, where quantum gravity dominated.
What occurs during the GUT Era?
From 10^-43 to 10^-36 seconds, the strong, weak, and electromagnetic forces unify.
True or false: The Electroweak Era lasts from 10^-36 to 10^-12 seconds.
TRUE During this era, the electromagnetic and weak nuclear forces are unified.
Fill in the blank: The Quark Era occurs from 10^-12 to 10^-6 seconds and involves _______.
Quarks and gluons forming protons and neutrons.
What is the Hadron Era?
From 10^-6 seconds to 1 second, quarks combine into protons and neutrons.
Define Lepton Era.
The period from 1 second to 10 seconds where leptons dominate the universe.
What happens during the Nucleosynthesis Era?
From 3 minutes to 20 minutes, protons and neutrons form the first atomic nuclei.
True or false: The Recombination Era occurs about 380,000 years after the Big Bang.
TRUE This era marks the formation of neutral hydrogen atoms.
Fill in the blank: The Dark Ages follow the Recombination Era and last until _______.
The formation of the first stars.
What is the Cosmic Microwave Background (CMB)?
Radiation from the early universe, released during the Recombination Era.
Define Inflation Era.
A rapid expansion of the universe occurring from 10^-36 to 10^-32 seconds.
What marks the end of the GUT Era?
The separation of the strong force from the electroweak force.
True or false: The Quark Era is characterized by the formation of atoms.
FALSE Atoms form later during the Recombination Era.
Fill in the blank: The Hadron Era ends when _______ occurs.
Baryogenesis, leading to matter-antimatter asymmetry.
What is the significance of the Nucleosynthesis Era?
It marks the formation of light elements like hydrogen and helium.
Define Matter Era.
The period after the Dark Ages when matter dominates the universe.
What occurs during the Stellar Era?
The time when stars and galaxies form and evolve.
True or false: The Recombination Era leads to a transparent universe.
TRUE Photons can travel freely after neutral atoms form.
Fill in the blank: The Big Bang occurred approximately _______ seconds ago.
13.8 billion years ago.
What is the End of the Universe theory?
Various hypotheses about the ultimate fate of the universe, including heat death.
Define Baryogenesis.
The process that produced an asymmetry between baryons and antibaryons.
What is the Age of the Universe?
The time elapsed since the Big Bang, currently estimated at 13.8 billion years.
True or false: The Cosmic Microwave Background is uniform throughout the universe.
TRUE It provides evidence for the Big Bang theory.
Fill in the blank: The Dark Energy Era refers to the period when _______ dominates cosmic expansion.
Dark energy accelerates the universe’s expansion.