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This video discusses four theories about the origin of the universe. The big-bang theory is the most well-known and accepted theory, which suggests that the universe began to expand about 13 and 15 million years ago. The inflationary theory is another popular theory, which suggests that the universe has been expanding slowly over time. The oscillating universe theory is a newer theory that suggests that the universe is constantly expanding and contracting. The theory of the eternal universe is a fourth theory that suggests that the universe is actually an oscillating universe. All of these theories suggest that the universe is finite, but it's still expanding.
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