COBE measured the cosmic microwave background temperature to be 2.725 K (-270°C).
Sources
- LiteBIRD aims to find evidence for the greatest expansion in the history of the Universe (cosmos.isas.jaxa.jp)
- http://www.scholarpedia.org/article/Cosmic_background_explorer (scholarpedia.org)
- https://lambda.gsfc.nasa.gov/product/cobe/about_firas.html (lambda.gsfc.nasa.gov)
- https://www.astro.ucla.edu/~wright/CMB-DT.html (astro.ucla.edu)
- https://www.flightpedia.org/convert/2.725-kelvin-to-celsius.html (flightpedia.org)
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