Astrophysicists have looked back 12 billion years to take the temperature of the infant Universe.
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References
Srianand,R., Petitjean, P. & Ledoux, C. The cosmic microwave background radiation temperature at a redshift of 2.34. Nature 408, 931 - 935 2000.
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Ball, P. Boost for Big Bang theory. Nature (2000). https://doi.org/10.1038/news001221-8
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DOI: https://doi.org/10.1038/news001221-8