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“好奇號”在火星大氣發現高濃度甲烷

分類:業界資訊 瀏覽數:28 2019-06-27 20:30 網易科技 辰辰 編輯: 厚學

6月24日消息,據國外媒體報道,美國宇航局旗下的“好奇號”火星探測器日前在火星大氣中發現了濃度驚人的甲烷。這一發現暗示了火星上存在外星生命的可能性,但科學家尚無任何確定性的結論,需要進行后續的探測。

據悉,“好奇號”火星探測器已經在這顆紅色星球上運行了7年,此次探測到的甲烷量是迄今為止濃度最高的。“好奇號”火星探測器探測到的甲烷含量比之前的發現高出三倍左右,這使得一些科學家猜測,這種氣體可能是生物產生的。

上周六的一篇報道根據該任務項目科學家阿什溫·瓦薩瓦達(Ashwin Vasavada)的一封內部電子郵件首次披露了這一令人好奇的發現。。當地時間周日,美國宇航局發布了一份聲明,證實了這一發現,解釋“好奇號”火星探測器的火星樣本分析儀器(SAM)在火星大氣中探測到含量為十億分之二十一的甲烷,其濃度比以往任何時候都要高得多。

在地球上,甲烷是微生物所產生的一種重要分子。在火星上探測到如此高濃度的甲烷不由讓人猜測,這顆星球上存在的微生物正在產生如此高濃度的甲烷,從而使得“好奇號”火星探測器獲得了相應的探測結果。

科學家們過去曾通過上世紀70年代的“海盜號”火星探測器在火星表面發現過甲烷存在的跡象。因此,發現更多甲烷并不一定意味著人類在火星發現了生命。火星甲烷濃度的激增并不罕見,去年6月的一項研究就報告火星大氣中的甲烷濃度隨季節變化。

美國宇航局科學任務理事會副主任托馬斯·祖布肯(Thomas Zurbuchen)在Twitter上警告稱,不要認為這就是火星上存在生命的證據。他指出,甲烷也可以由地質過程產生。

祖布肯在推文中指出,“‘好奇號’火星車在此次任務中測量到有史以來濃度最大的甲烷量。雖然這是一個令人興奮的發現,但并不一定意味著生命的存在,因為甲烷可以通過巖石和水之間的相互作用產生。”

重要的是,“好奇號”現在還有一些額外的工作要做,周末還進行了一系列后續實驗,“以收集更多關于甲烷濃度的信息。”美國宇航局指出,“以前也曾發現過這種不尋常的甲烷濃度上升,但我們并不確定它們能持續多久,也不知道可能是什么原因造成的。”據報道,后續實驗的結果最早將于當地時間本周一公布。

不過美國宇航局指出,“好奇號”上沒有配備能夠確定甲烷可能來自何處的儀器。

火星樣本分析儀器首席研究員保羅·馬哈菲(Paul Mahaffy)在一份聲明中說:“根據我們目前的探測,我們無法判斷甲烷的來源是生物活動還是地質活動,甚至也無法判斷其來自古代還是現代。”

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