What Is the Cosmic Microwave Background Radiation

question 74

Multiple Choice

What is the cosmic microwave background radiation?

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

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