Blue Shift CSM

What is the color of the universe?


  • The displacement of the spectrum of an approaching celestial body toward shorter wavelengths
  • Astronomers first studied faraway star surfaces by looking at the redshift or blueshift of light coming from the stars, a technique called Doppler imaging, which reveals movement on the stars’ surfaces
    Any decrease in wavelength, with a corresponding increase in frequency, of an electromagnetic wave
  • In visible light, this shifts the color from the red end of the spectrum to the blue end
  • Within a hypothetical universe undergoing a runaway big crunch contraction, a cosmological blueshift would be observed, with galaxies further away being increasingly blueshifted

Expanded info:

The answer to “What color is the universe?”

  • Cosmic Latte is a name assigned to the average color of the universe, given by a team of astronomers from Johns Hopkins University
  • The Universe appears like a vast darkness to the eye, but the average color is actually beige, according to scientists. They studied the color of light emitted by 200,000 galaxies to see what the final mix would be if the entire sky was smeared out and so the color was named
  • This color has become much less blue over the past 10 billion years, which indicates redder stars are becoming more prevalent