Where is the cosmic microwave background strongest observed from Earth?
Quick Answer
It is observed most clearly from space or very high, dry ground away from radio noise. The signal comes from every direction in the sky, with a temperature of about 2.725 K.
The Full Story
The cosmic microwave background, or CMB, is not tied to one single place in the sky; it is the faint afterglow of the Big Bang seen from all directions. Scientists observe it best from space missions such as COBE, WMAP, and Planck, or from dry high-altitude observatories that minimize atmospheric interference. The CMB was discovered accidentally by Arno Penzias and Robert Wilson in 1965. Its nearly uniform temperature of about 2.725 kelvin makes it one of the most important signals in cosmology.
Key Facts
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"The universe's oldest light is all around you — here’s where we see it best."
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