What is a key hazard of long spaceflights to astronauts?

Radiation exposure.

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  1. Lack of sunlight
  2. Radiation exposure ✔
  3. Too much gravity

Why: Radiation is an invisible hazard in space, and shielding, alerts, and dosimetry help protect crews.

Huh, didn't know that: Radiation is an invisible hazard in space, and shielding, alerts, and dosimetry help protect crews.

The dad joke
Radiation is a hazard you cannot see coming.
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References

Answer: Radiation exposure. Radiation is an invisible hazard in space, and shielding, alerts, and dosimetry help protect crews.

  1. Space exploration en.wikipedia.org/wiki/Space_exploration
    Radiation is an insidious health hazard to space travelers as it is invisible and can cause cancer.
    Checked 2026-11-07.

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