土卫二理论上可能存在外星生物
文章来源:未知 文章作者:enread 发布时间:2017-04-20 07:56 字体: [ ]  进入论坛
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Saturn's icy moon Enceladus could theoretically be home to methane1-producing alien life, NASA said Thursday.
 
美国宇航局周四表示,冰冷的土星卫星土卫二理论上可能存在释放甲烷的外星生物。
 
Researchers made the announcement based on data from 2015, when the spacecraft Cassini detected the presence of hydrogen during a flyby through a plume2 of gas and ice erupting from Enceladus' south pole. The hydrogen, which is escaping into space from a hydrothermal vent3 on the moon's seafloor, could be a sign of methanogenesis, a form of anaerobic4 respiration5 in which microbes produce methane.
 
"This is a very significant finding because the hydrogen could be a potential source of chemical energy for any microbes that might be in Enceladus' ocean," Linda Spilker, a scientist at NASA's Jet Propulsion Laboratory, said Thursday at a press conference.
 
"We now know that Enceladus has almost all of the ingredients you would need to support life as we know it on Earth," she said.
 
The findings were published Thursday in the journal Science.


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1 methane t1Eyx     
n.甲烷,沼气
参考例句:
  • The blast was caused by pockets of methane gas that ignited.爆炸是由数袋甲烷气体着火引起的。
  • Methane may have extraterrestrial significance.甲烷具有星际意义。
2 plume H2SzM     
n.羽毛;v.整理羽毛,骚首弄姿,用羽毛装饰
参考例句:
  • Her hat was adorned with a plume.她帽子上饰着羽毛。
  • He does not plume himself on these achievements.他并不因这些成就而自夸。
3 vent yiPwE     
n.通风口,排放口;开衩;vt.表达,发泄
参考例句:
  • He gave vent to his anger by swearing loudly.他高声咒骂以发泄他的愤怒。
  • When the vent became plugged,the engine would stop.当通风口被堵塞时,发动机就会停转。
4 anaerobic BLzyN     
adj.厌氧的
参考例句:
  • Anaerobic respiration occurs only in particularly active tissues such as muscles during severe exercise. 厌氧呼吸只有在处于剧烈运动状态的肌肉等特别活跃的组织中才会发生。
  • Infection,especially anaerobic infection, is much more apt to occur.感染,特别是厌氧感染很容易发生。
5 respiration us7yt     
n.呼吸作用;一次呼吸;植物光合作用
参考例句:
  • They tried artificial respiration but it was of no avail.他们试做人工呼吸,可是无效。
  • They made frequent checks on his respiration,pulse and blood.他们经常检查他的呼吸、脉搏和血液。
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