- Temperature — tardigrades can survive being heated for a few minutes to 151°C or being chilled for days at -200°C, or for a few minutes at -272°C. (1° warmer than absolute zero).
- Pressure — they can withstand the extremely low pressure of a vacuum and also very high pressures, many times greater than atmospheric pressure. It has recently been proven that they can survive in the vacuum of space. Recent research has notched up another feat of endurance: apparently they can withstand 6,000 atmospheres pressure, which is nearly six times the pressure of water in the deepest ocean trench.
- Dehydration – tardigrades have been shown to survive nearly one decade in a dry state. Another researcher reported that a tardigrade survived over a period of 120 years in a dehydrated state, but soon died after 2 to 3 minutes. Subsequent research has cast doubt on its accuracy since it was only a small movement in the leg.
- Radiation — as shown by Raul M. May from the University of Paris, tardigrades can withstand 5,700 grays or 570,000 rads of x-ray radiation. (Ten to twenty grays or 1,000–2,000 rads could be fatal to a human). The only explanation thus far for this ability is that their lowered hydration state provides fewer reactants for the ionizing radiation.
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