地球上的最后生物将是微生物
[i=s] 本帖最后由 xln1120 于 2013-7-5 17:34 编辑 [/i][font=Verdana, Arial, Tahoma][size=12px][b]The last surviving creatures on Earth will be tiny organisms living deep underground, according to scientists.[/b][/size][/font]
[font=Verdana, Arial, Tahoma][size=12px][b]科学家认为，地球上最后生存的生物将是生活在地下深处的微生物，因为随着太阳变得越来越热，越来越亮，只有细菌才能在这种极端条件下苟延残喘。[/b][/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]Researchers used a computer model to assess our [url=http://www.enread.com/news/cultureandedu/93260.html]planet[/url]'s fate billions of years from now.[/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]They found that as the Sun becomes hotter and brighter, only microbes would be able cope with the extreme conditions that the solar changes would bring.[/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]The research is being presented at the National Astronomy Meeting.[/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]Jack O'Malley James, from the University of St Andrews in Scotland, said: "There won't be very much oxygen present, so they need to be able to survive in low or zero-oxygen environments, high pressures, and high salinities because of evaporating oceans."[/size][/font]
[font=Verdana, Arial, Tahoma][size=12px][b]Mass extinction[/b][/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]The future of life on Earth is tied to that of the Sun, and over time, our star will become more and more[b]luminous（明亮的）[/b].[/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]Scientists from the universities of St Andrews, Dundee and Edinburgh used this fact to create a forecast for our planet's future [url=http://www.enread.com/news/cultureandedu/93260.html]environment[/url].[/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]In a billion years' time, the heat from the Sun will become so intense, that the oceans start to evaporate.[/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]"Once you get to this tipping point, you get a lot more water in the atmosphere and because water vapour is a greenhouse gas, that sets this runaway greenhouse effect... and you end up with the Earth heating up to 100C or more plus what we experience today," explained Mr O'Malley James, a PhD student.[/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]This, he said, combined with falling levels of oxygen, would lead to the rapid loss of plants and larger animals.[/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]Soon after, a group of microbes called[b]
extremophiles（极端微生物）[/b]
would be the only life forms left.[/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]These tiny organisms are found on Earth today, and can cope with hostile environments.[/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]These, the scientists said, would be the only creatures that could withstand the heat, aridity and poisonous atmosphere of this future [url=http://www.enread.com/news/cultureandedu/93260.html]Earth[/url]. They believe that they would probably be clustered around the last drops of water deep underground.[/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]Eventually as conditions worsen they too will vanish, and in about 2.8 billion years, Earth will be devoid of all life.[/size][/font]
[font=simsun][size=12px][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun]更多[/font][/font][/font][/font][/font][/font][/size][url=http://www.enread.com/news/index.html][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=宋体, Verdana, Arial, Helvetica, sans-serif][size=24px][color=#ED1C24][b]英语新[/b][/color][/size][/font][/font][/font][/font][/font][/font][/font][/font][/font][/font][/font][/font][/font][/font][/font][/font][/url][url=http://www.enread.com/news/index.html][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][font=simsun][color=#ED1C24][size=24px][b]闻[/b][/size][/color][/font][/font][/font][/font][/font][/font][/font][/font][/font][/font][/font][/font][/font][/font][/font][/url][/font] Horrible tiny organisms
页:
[1]