d. it started as a fixed amount that has been spread out wide across the entirety of the universe.
The cosmic background radiation, also known as the cosmic microwave background (CMB), originated from the hot and dense early universe. It was emitted when the universe was about 380,000 years old and has been expanding and getting weaker as the universe itself expands. As the universe expands, the CMB radiation gets spread out over a larger area, making it weaker compared to its initial intensity.
Why is the cosmic background radiation weak today?
a. the big bang wasn't as powerful as originally suspected
b. the energy from cosmic background radiation is absorbed by galaxies
c. cosmic background radiation cannot be measured by current science equipment
d. it started as a fixed amount that has been spread out wide across the entirety of the universe
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