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「嫦娥四號」登月球背面 傳回首張影像圖 2019.01.18
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本月三日,中國「嫦娥四號」探測器在經過約三十八萬公里、二十六天的漫長飛行後,於月球背面南極艾特肯盆地內的馮.卡門撞擊坑正式着陸,並通過「鵲橋」中繼星,傳回了世界首張近距離拍攝的月背影像圖,這次行動亦是首次有人類探測器在月背軟着陸。「嫦娥四號」着陸區地形起伏達六千米,是太陽系中已知最大的撞擊坑之一,被認為對研究月球和太陽系早期歷史具有重要價值。

看不到的月球背面?
為甚麼在地球上,我們永遠看不到月球的另一面呢?因為月球和地球一樣,公轉同時也在自轉。月球的公轉周期和自轉周期相同,月球自轉的周期為27.3日,而月球圍繞地球公轉的周期同樣是27.3日,因此月球永遠以同一面朝向地球。

On 3 January, after a 380,000-km journey that took 26 days, China’s Chang’e-4 probe landed in the Von Karman crater, which is located in the South Pole-Aitken basin at the far side of the Moon. Through the Queqiao (Magpie Bridge) relay satellite, the probe sent back the first close-up photo of the dark side of the moon. This mission is also the first time a man-made probe has soft-landed on the far side of the moon. The landing area has ups and downs that are 6,000 metres apart, and is one of the largest known craters in the solar system; it is very important to the early history of the moon and the solar system.

文︰馮霆朗 圖︰星島圖片庫、網上圖片

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