extremophiles
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Study casts doubt on the chances of life on watery alien planets
Scientists searching for habitable planets often see the presence of water as a key sign, but they might not want to raise their hopes too high. A recently published study has indicated that there was no clear evidence of extremophiles (life that can survive extreme conditions) in Ethiopia's Danakil Depression, home to some of the world's most acidic, saltiest and superheated water. In other words, the mere existence of water isn't enough -- the conditions have to be at least slightly conducive to life. Accordingly, water that was 'just' very salty included numerous forms of extremophiles, including several newly discovered examples.
