小行星貝努蘊藏著生命的基石
Asteroid Bennu Holds the Building Blocks of Life
發表日期:2025-02-12
一塊太空岩石能告訴我們關於地球生命的什麼資訊? 2020 年 10 月,NASA 的 OSIRIS-REx 太空飛行器小心翼翼地接近了近地小行星 101955 Bennu,以採集其表面樣本。 2023 年 9 月,機器人飛船將這些樣本送回地球。 最近的一項分析表明,這些樣本中竟然含有 20 種已知氨基酸中的 14 種,而這些氨基酸正是生命的基本組成成分。 氨基酸的存在再次提出了一個大問題:生命是否起源於太空? 然而,蛋白質結構單元本身卻帶來了另一個驚喜--它們含有均勻混合的左旋和右旋氨基酸--這與我們地球上只有左旋氨基酸形成了鮮明對比。 這就提出了另一個大問題:為什麼地球上的生命只有左旋氨基酸? 關於這個問題的研究肯定會繼續下去。
原文:What can a space rock tell us about life on Earth? NASA's OSIRIS-REx spacecraft made a careful approach to the near-Earth asteroid 101955 Bennu in October of 2020 to collect surface samples. In September 2023, the robotic spaceship returned these samples to Earth. A recent analysis has shown, surprisingly, that the samples contained 14 out of the 20 known amino acids that are the essential building blocks of life. The presence of the amino acids re-introduces a big question: Could life have originated in space? However, the protein building blocks themselves held another surprise -- they contained an even mixture of left-handed and right-handed amino acids -- in contrast to our Earth which only has left-handed ones. This raises another big question: Why does life on Earth have only left-handed amino acids? Research on this is sure to continue.
※ 本文由萌芽機器人自動轉貼自每日一天文圖(Astronomy Picture of the Day,APOD),原文為英文,正體中文是透過 DeepL 翻譯及 OpenCC 進行自動處理,內容僅供參考,若有任何錯誤之處還請見諒!
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