What Is the Cosmic Microwave Background Radiation

question 216

Multiple Choice

What is the cosmic microwave background radiation?

• A) uniform background of radiation from electrons spiraling in weak intergalactic magnetic fields
• B) radiation left over from the Big Bang after the universe expanded and cooled
• C) almost uniform background of radiation from distant, unresolved, overlapping galaxies
• D) radiation from a very tenuous, ionized gas that fills the universe equally in all directions

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