How do cosmic rays fundamentally differ in nature from Cosmic Microwave Background (CMB) radiation?

Answer

Cosmic rays are discrete, high-energy particles, whereas CMB is ancient, low-energy electromagnetic radiation.

Cosmic rays are tiny bits of matter moving at high speed, while the CMB is the faint, uniform, residual microwave glow left over from the Big Bang.

How do cosmic rays fundamentally differ in nature from Cosmic Microwave Background (CMB) radiation?

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