RADIATION IN OUTER-SPACE

http://www.space.com/21353-space-radiation-mars-mission-threat.html

Many ignore the fact that earth is covered by a protective layer called the atmosphere which protects us from the radiation of the sun.

The higher you go in the atmosphere, the less oxygen there is, hence the reason people struggle to breath when climbing very high mountains or why the cabins of planes are pressurised.

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