Cosmic Microwave Background Radiation 2 | Summary and Q&A

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November 18, 2010
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Khan Academy
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Cosmic Microwave Background Radiation 2

TL;DR

No, we will not run out of cosmic background radiation because as the universe expands, we will be able to observe photons from further distances.

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Questions & Answers

Q: What is cosmic background radiation?

Cosmic background radiation refers to the radiation emitted by a uniform hydrogen plasma that existed in the early universe, about 13.7 billion years ago.

Q: Will there be a point in the future when there is no more cosmic background radiation?

No, there will always be cosmic background radiation because as the universe expands, we will be able to observe photons from further distances.

Q: How will the cosmic background radiation change in the future?

In the future, the cosmic background radiation will come from a more differentiated universe, with the photons emitted by early stars and objects further away from us.

Q: Will the observable universe continue to expand?

Yes, as time passes, the observable universe will grow, allowing us to observe more of the universe and its cosmic background radiation.

Summary & Key Takeaways

  • When we observe light from the edge of the observable universe, we are not only seeing light that has traveled a long distance, but also light that was emitted a long time ago.

  • The cosmic microwave background radiation is the radiation emitted by a hydrogen plasma that was uniform across the universe about 13.7 billion years ago.

  • As the universe continues to evolve and differentiate, the cosmic microwave background radiation will change, but it will still be present.

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