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Questions and Answers
According to the Big Bang theory, when did space and time emerge together?
According to the Big Bang theory, when did space and time emerge together?
What is the approximate diameter of the observable universe?
What is the approximate diameter of the observable universe?
Who developed the heliocentric model with the Sun at the center of the Solar System?
Who developed the heliocentric model with the Sun at the center of the Solar System?
What did Isaac Newton build upon to develop the law of universal gravitation?
What did Isaac Newton build upon to develop the law of universal gravitation?
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What is the approximate number of galaxies in the observable universe?
What is the approximate number of galaxies in the observable universe?
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What is the overall distribution of galaxies in the universe at the largest scale?
What is the overall distribution of galaxies in the universe at the largest scale?
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According to the Big Bang theory, what is the most widely accepted model of the universe?
According to the Big Bang theory, what is the most widely accepted model of the universe?
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What is dark matter?
What is dark matter?
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What is the percentage of ordinary ('baryonic') matter in the physical universe?
What is the percentage of ordinary ('baryonic') matter in the physical universe?
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What is the prevailing model for the evolution of the universe?
What is the prevailing model for the evolution of the universe?
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What were the first subatomic particles and simple atoms formed from?
What were the first subatomic particles and simple atoms formed from?
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What is the definition of the physical universe?
What is the definition of the physical universe?
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During which period of the universe's existence did the four fundamental forces separate?
During which period of the universe's existence did the four fundamental forces separate?
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What is the process called when stable protons and neutrons form more complex atomic nuclei through nuclear fusion?
What is the process called when stable protons and neutrons form more complex atomic nuclei through nuclear fusion?
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What is the cosmic microwave background (CMB) made up of?
What is the cosmic microwave background (CMB) made up of?
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What marked the end of the radiation-dominated era and the start of the matter-dominated era?
What marked the end of the radiation-dominated era and the start of the matter-dominated era?
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What is the ratio of the number of hydrogen to helium atoms in the universe?
What is the ratio of the number of hydrogen to helium atoms in the universe?
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What is the approximate duration of the Planck epoch?
What is the approximate duration of the Planck epoch?
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What is the name given to the period when the universe was still too hot for matter to form neutral atoms?
What is the name given to the period when the universe was still too hot for matter to form neutral atoms?
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What is the name of the process where ordinary matter formed large gas clouds, stars, and galaxies due to the attraction to concentrations of dark matter?
What is the name of the process where ordinary matter formed large gas clouds, stars, and galaxies due to the attraction to concentrations of dark matter?
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