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日益精進的望遠鏡不斷改寫我們對宇宙的想像。天文學家透過能看向八個已知行星外昏暗區域的大型望遠鏡,注意到數顆海王星外的天體( TNO )正在和諧地運行。加州理工學院的麥可・布朗( Mike Brown )和康斯坦丁・巴提金( Konstantin Batygin )更在 2016 年提出第九顆行星的可能性。雖然目前的大口徑望遠鏡和廣角相機還沒有看見它,但搜尋結果讓天文學家越來越有信心。接下來的大型綜合巡天望遠鏡( LSST )很有機會讓我們一睹它的真面目,且更加瞭解太陽系。( P.40 ) 說起來我們對太空的心情很矛盾。一方面花費無數金錢和腦力去尋找可以移居的「樂土」,一方面又時時擔憂天外飛來的災禍,例如小行星撞擊。二年後,NASA 有艘太空船會衝向某塊太空岩石,試圖改變其軌道速度。科學家希望藉此測試,能否在未來發現小行星來襲時,讓它偏轉以救大家一命。( P.48 ) 新年開始的同時,也來回顧一下去年重大的有趣發現吧。( P.22 )

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