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地球嘅將來

地球俾紅巨星太陽燒做一塊焦土嘅想像圖

地球嘅將來涉及科學家對「地球第時會變成點嘅樣」嘅猜想。

最終命運

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根據天體物理學上嘅研究估計,响 50 億年之後,太陽同好多恆星一樣,會變做一粒紅巨星(Red giant),地表呢個時候已經形成唔到生物生存必需嘅複雜分子。個模型預測太陽將會膨脹,直徑會變成而家嘅 250 倍,亦即係大約 1 AU(150,000,000 公里)。據估計,地球跟住落嚟嘅命運係點好難講:變做紅巨星嗰陣,太陽會冇咗 30% 嘅質量,所以如果唔考慮潮汐嘅影響,當太陽體積最大嗰陣,地球會郁到去大約距離太陽 1.7 AU(250,000,000 公里)咁遠,噉就會擺脫俾膨脹嘅太陽吞噬嘅命運;但就算係噉,太陽嘅光度峰值將會變成而家嘅 5,000 倍,地球上淨低嘅生物都走唔甩,冚唪唥都會俾極之猛烈嘅陽光摧毀[1]

睇埋

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[編輯]
  1. Sackmann, I.-J.; Boothroyd, A. I.; Kraemer, K. E. Our Sun. III. Present and Future. Astrophysical Journal. 1993, 418: 457–68.
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地球嘅將來
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