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   chance      chemicals      discovery      enough      environment      faster      form      highly      landscape      layer      life      organism      quickly      radiation      rays      research      surface      things      uninhabitable      what  
Scientists have discovered new about the atmosphere and on Mars. They found a "toxic cocktail" of that would easily kill any living . The chemicals have been found on the surface of the Red Planet. The scientists, from Edinburgh University in the UK, say the of the chemicals means the of finding life on Mars has fallen. The scientists are astrobiologists – they study the atmosphere and environments in the universe that might support . The researchers said Mars had no ozone , which means there are high levels of ultra-violet (UV) . The mix of UV radiation and the chemicals sterilized the Martian .

The scientists tested happens when the chemicals found on Mars mix with UV radiation. They found it killed organisms very . The chemicals alone were to kill living organisms. However, when the chemicals were mixed with UV , the mix killed organisms 11 times . The scientists said: "Our observations show that the of present-day Mars is [harmful] to cells, caused by a toxic cocktail of [chemicals] and UV radiation." They added that their was further evidence that the surface of Mars is deadly to any of plant life. They say the chemicals and UV rays make, "much of the surface and near-surface regions ".

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