Identify which of the following statements are true. The moment after the Big Bang, the universe expanded rapidlyAtoms existed at the time of the Big BangSince the Big Bang, the universe has not expanded at a constant rateOur Sun was one of the first stars in the universe to form
Question
Identify which of the following statements are true. The moment after the Big Bang, the universe expanded rapidlyAtoms existed at the time of the Big BangSince the Big Bang, the universe has not expanded at a constant rateOur Sun was one of the first stars in the universe to form
Solution
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True - The moment after the Big Bang, the universe expanded rapidly. This is a widely accepted theory known as cosmic inflation.
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False - Atoms did not exist at the time of the Big Bang. The universe was too hot and dense for atoms to form. It took about 380,000 years after the Big Bang for the universe to cool down enough for the first atoms to form.
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True - Since the Big Bang, the universe has not expanded at a constant rate. The rate of expansion has changed over time. In the early universe, the expansion slowed down, but it has been accelerating for the past few billion years.
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False - Our Sun was not one of the first stars in the universe to form. The Sun is about 4.6 billion years old, while the universe is about 13.8 billion years old. The first stars began to form a few hundred million years after the Big Bang.
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According to the big bang theory, the known universe started 13.7 billion years ago in a hot dense state and expanded explosively. As it expanded, it cooled down to the point where atoms could form. By the force of gravity, these atoms coalesced into gas clouds that eventually became stars. These stars eventually formed young galaxies. Which of the following is true about the current position of the galaxies in the universe? A. The position of the galaxies cannot be predicted. B. The galaxies are now moving closer together. C. The galaxies are now drifting further apart. D. The position of the galaxies is not changing.
Match the following events with when they were first created or occured after the formation of the universe according to the notes. *9 points0 seconds 10^-36 seconds 1 microsecond 100 seconds 380,000 years 100 million years 500 million years 4 billion years 13.8 billion yearsBig Bang The Cosmic Microwave Background Greatest rate of star formation First nuclei The period of greatest expansion First subatomic particles First galaxies First stars Present day Big Bang The Cosmic Microwave Background Greatest rate of star formation First nuclei The period of greatest expansion First subatomic particles First galaxies First stars Present day
At moments after the big bang, the entire mass of the universe was compressed to the size of*1 pointthe Earththe Sunthe Milky Wayan Atom
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