Tag: Cosmology
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The Glory and Despair of Cosmology
The Universe is filled with photons at 2.7 K (2.7° C above absolute zero), left over from when the Universe was 380,000 years old. These photons reveal a lot about the early era of the cosmos: its contents, temperature, and incredible uniformity. Because these photons fall in the microwave portion of the spectrum, they are…
Galileo's Pendulum 