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Updated February 03, 2022
  Dark night sky paradox

Image: The sky in visible light. Stars have a finite age and therefore a lifespan. Their source of light is too ephemeral for them to be able to saturate space with their radiance. Credit: Stellarium image

Hubble Ultra Deep Field

Image: The sky in infrared observation
This infrared view reveals very distant galaxies that existed a very long time ago. Taken by the Near Infrared Camera and Multi-Object Spectrometer aboard the Hubble Space Telescope. Credit: NASA/ESA

diffuse background of the universe WMAP

Image: This complete CMB (Cosmic Microwave Background) map shows the temperature fluctuations of the early Universe as it became transparent ~380,000 years after the Big Bang. The maximum temperature difference between the cold blue zones and the hot red zones is of the order of 0.0001 °C. Credit: Photomontage of shots taken by Planck (ESA satellite) over 9 years.


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