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TheCanadian
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Is there any observation evidence for the expansion of the universe besides redshift?
Quite a lot. This essay has a good overview of all of the main lines of evidence:TheCanadian said:Is there any observation evidence for the expansion of the universe besides redshift?
Observational evidence for the expansion of the universe is based on the observation that galaxies are moving away from each other. This is known as the Hubble's Law, which states that the further away a galaxy is from us, the faster it is moving away. This suggests that the universe is expanding.
This evidence was first discovered by American astronomer Edwin Hubble in the 1920s. He observed that distant galaxies had a redshift in their light spectrum, indicating that they were moving away from us.
Other evidence for the expansion of the universe includes the cosmic microwave background radiation, which is a remnant of the Big Bang, and the abundance of light elements such as hydrogen and helium in the universe.
The observational evidence for the expansion of the universe is a key piece of evidence for the Big Bang theory. The expansion of the universe suggests that the universe was once much smaller and denser, and has been expanding since the Big Bang.
While the majority of scientists accept the expansion of the universe as evidence for the Big Bang, there are some alternative explanations such as the Steady State theory. However, these theories have not been widely accepted due to a lack of supporting evidence.