what does the redshift of light from galaxies indicate?
the universe is mainly hydrogen
the universe is 13.8 billion years old
the universe is expanding
the universe is cooling off
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The redshift of light from galaxies indicates that the universe is expanding. As the universe expands, the wavelengths of light from distant galaxies get stretched, causing a shift towards the red end of the spectrum. This phenomenon is known as cosmological redshift. Additionally, the fact that the universe is expanding supports the idea that the universe is cooling off over time. The age of the universe, estimated to be around 13.8 billion years old, is unrelated to the redshift of light from galaxies. However, it is worth noting that the composition of the universe is mainly hydrogen.
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