Are humans exposed to cosmic background radiation?

Answer 1

Yes. But the intensity of the cosmic background radiation is so low we do not notice it without very precise measurements.

Compared to the thermal radiation that Earthly objects typically emit at room temperature, the cosmic background radiation is millions of times less intense, with a temperature of only 2.7 K.

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Answer 2

Hailey Alexander

It is true that humans are exposed to cosmic background radiation. This radiation comes from sources outside of our solar system, like far-off stars and galaxies. It enters the Earth's atmosphere and travels to the surface, where it adds to the background radiation that we are exposed to every day. Nevertheless, the amounts of cosmic background radiation that humans are exposed to are generally quite low and do not pose a health risk to humans.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.