They have used their observations to develop a theory called the Big Bang. Evidence that the universe is expanding is best supported by the observation that the wavelengths of light from distant galaxies are shifted toward the A) red end of the spectrum because they are shortened B) red end of the spectrum because they are lengthened C) blue end of the spectrum … Four independent lines of evidence that build up one of the most influential and well-supported theories in all of cosmology.

The universe is approximately 13.8 billion years old. The Big Bang theory. This apparent change in wavelength can also be observed for the visible light emitted by stars or galaxies.

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But there are more lines of evidence.

A major piece of evidence supporting the Big Bang theory is the observation that wavelengths of light from stars in distant galaxies show a (1) redshift, appearing to be shorter (2) redshift… Red shift data provides evidence that the Universe, including space itself, is expanding. Scientists have gathered a lot of evidence and information about the Universe. Compared to the age of the solar system, the age of the universe is approximately

So, if a star is moving towards Earth, it appears to emit light that is shorter in wavelength compared to a source of light that isn’t moving.

11.Starlight from distant galaxies provides evidence that the universe is expanding because this starlight shows a shift in wavelength toward the 12.The diagram below shows a standard spectrum compared to a spectrum produced from a distant star.