🌍 where
Where is the cosmic microwave background observed from?
AstronomyCosmology
Quick Answer
It is observed from everywhere in the observable universe. It is not a place in space but a faint microwave glow coming from all directions.
The Full Story
The cosmic microwave background, or CMB, is seen from every direction in the sky. It is the remnant radiation left over from about 380,000 years after the Big Bang, when the universe first became transparent. Scientists measure it with space missions such as COBE, WMAP, and Planck. Its nearly uniform temperature is about 2.725 kelvin, with tiny fluctuations that reveal the early structure of the universe.
Key Facts
1.Left over from about 380,000 years after the Big Bang
2.Average temperature is about 2.725 K
3.Mapped by COBE, WMAP, and Planck
YouTube Angle
Suggested video title for this topic:
"The oldest light in the universe is all around you."