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  1. Step 1: Rank the killers
  2. Step 2: Compare mission choices
  3. Step 3: Simulate oxygen for four
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Tactical Op · PRIORITISE

Rank the killers

Order these threats from fastest to slowest to harm an unprotected human.

  1. 1
    No breathable oxygenAtmosphere is 95% carbon dioxide
  2. 2
    Cosmic radiationNo global magnetic field
  3. 3
    Extreme coldAverage −60 °C
  4. 4
    Near-vacuum pressureUnder 1% of Earth sea-level pressure
  5. 5
    Toxic perchlorate dustFine, clinging soil chemistry