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The scientific explanation that suggests the universe is expanding is based on Einstein's theory of relativity, where he found that the universe should be either expanding or contracting. It is also based on astronomers noticing the red tinge of light from nearby galaxies, meaning they were getting farther away.

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9y ago
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6mo ago

The first concept is that of the redshift, which is the observation that light from distant galaxies appears to be shifted towards longer wavelengths. This indicates that these galaxies are moving away from us. The second concept is the cosmic microwave background radiation, which is a faint radiation that is present throughout the universe and is thought to be leftover electromagnetic radiation from the early stages of the universe. Together, these concepts support the idea that the universe is expanding.

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Q: The scientific explanation that suggests the universe is expanding relies on two main concepts?
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