- Every Challenge Astronauts Will Face on a Flight to Mars https://www.universetoday.com/149835/every-challenge-astronauts-will-face-on-a-flight-to-mars/ 3 comments space
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- Apollo 17 | NASA http://www.nasa.gov/mission_pages/apollo/missions/apollo17.html 67 comments
- https://www.nrc.gov/about-nrc/radiation/around-us/doses-daily-lives.html 37 comments
- Exploring the Universe with Nuclear Power - Universe Today http://www.universetoday.com/118431/exploring-the-universe-with-nuclear-power/ 25 comments
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