NASA 7年天上挖,半斤尘土带回家

美國於2016年發射探測器「OSIRIS-REx」,亦是美國第一個小行星採樣探測器,2018年進入小行星「貝努」運行的軌道。在經過近兩年時間繞行後,2020年10月,OSIRIS-REx終於取得與「貝努」表面足夠近的距離,並以機械臂採集到大約250克岩石和塵土樣本。 OSIRIS-REx釋出樣本艙之後,會離開地球軌道,前往探索另一顆名為「阿波菲斯」(Apophis)的近地小行星。

 
圖為2018年12月2日,OSIRIS-REx拍攝的小行星「貝努」(Bennu)圖像。(路透社)
圖為2018年12月2日,OSIRIS-REx拍攝的小行星「貝努」(Bennu)圖像。(路透社)
 

「貝努」在1999年被發現,由一堆鬆散的岩石組成,每隔6年就會在距離地球靠近的位置經過一次。其直徑大約500米,約45億年前形成,目前距離地球約3.2億公里。科學家認為,對「貝努」的研究有助了解行星的形成和地球生命起源,以及如何避免行星撞向地球。此外,小行星上亦可能有具價值的資源和貴金屬。

原文網址: NASA太空艙帶回歷來最大份量小行星樣本 助研究預防地球被撞擊 | 香港01 https://www.hk01.com/article/944469?utm_source=01articlecopy&utm_medium=referral

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