536期 2019-10-14 衛星競賽

536期 2019-10-14 衛星競賽

圖片故事:
太陽系的衛星競賽出現新贏家。科學家上周表示,土星周圍發現20顆新衛星,總數達82顆,比本來排第一木星的79顆多。

美聯社報導,卡內基科學研究所天文學家謝柏德(Scott Sheppard)說:「發現土星才是真正的衛星之王,真的很有趣。」

但木星迷不必太失望,木星的衛星之一木衛三(Ganymede)大約是地球的一半,還是太陽系最大的衛星。

謝柏德與研究團隊是透過夏威夷的天文望遠鏡發現土星新衛星。他說,可能還有100顆更小的衛星等著被發現。但若要找到德說,天文學家大致盤點完土星周圍小至5公里與木星周圍小至1.6公里的衛星。要觀察到更小的衛星,需要更大的望遠鏡。而且要找到土星的迷你衛星難度高,因為土星離地球較遠。

去年,木星12顆新衛星也是同一個團隊發現的。

好讀本周五問:
1.太陽系有幾顆行星?
2.太陽系行星中最少衛星的是哪一顆?
3.木星最大特徵是?
4.地球上有哪些事和「衛星」有關?
5.地球只有一顆衛星,請舉兩件和這顆衛星相關的事。


10月16日/周三晚上10:00截稿,獲刊登者贈小禮一份,另選特別獎,神祕禮相贈。

 

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