Spectroscopic Redshift
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PHYSICS
Astrophysics
Spectroscopic Redshift
Spectroscopic redshift reveals the universe's expansion by stretching light from distant galaxies
1 Feb 2026
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How does spectroscopic redshift help astronomers determine the distance to faraway galaxies?
By measuring the brightness of the galaxy's light to estimate its size
By detecting the presence of specific chemical elements in the galaxy's atmosphere
By measuring the increase in wavelength of spectral lines, indicating the galaxy's recessional velocity due to universe expansion
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