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            世界末日存在嗎宇宙的壽命有多長

            時間:2019-03-24 12:06:11編輯:梓嵐

            根據宇宙的大爆炸學說可知,宇宙產生于200億年前,而且在不斷膨脹。這使得人們不禁要問,宇宙要膨脹到何時,宇宙的歸宿是什么樣呢?

            宇宙間的萬物生生死死,變化無窮。但宇宙永恒、無始無終。然而,宇宙壽命究竟是多少歲?科學家試圖破解這個謎團。

            世界末日存在嗎宇宙的壽命有多長

            宇宙物質的運動是循環衍生的(生命只是物質運動的一種形式)。據計算,任何恒星經過100萬億年都會與另一顆恒星接近一次。這樣恒星周圍的行星就會被撞出而流離失所。這時,90%的恒星逃離星系,剩余者則形成一個大黑洞。

            說到宇宙的年齡,人類不能再用通常的尺度,不是用百萬年,而是用億年為單位。但對宇宙的年齡,科學家們只是在推測和估算,還沒有找到一種絕對準確的方法。所以科學家們采用各種方法來取得能夠接近真實的結果。用同位素年代法測量地球、月球和太陽年齡是一種好方法。經測定,地球年齡為40億~50億年,月球年齡為46億年,太陽年齡為50億~60億年。運用這種方法測定宇宙年齡,天文學家布查測定的結果為120億年。

            世界末日存在嗎宇宙的壽命有多長

            球狀星團測定法是根據恒星演化理論來測算恒星年齡的一種方法,利用該法求得的宇宙年齡為80億~180億年。但是,人們對恒星進行觀測發現,最老的恒星年齡約200億年,因此,180億年的年齡是不夠的。那么,宇宙的年齡到底是多少呢?

            哈勃常數測定法是基于宇宙膨脹的觀測事實確立的。在一個不斷膨脹的宇宙中,測定膨脹速度可通過紅移量的測量來獲得。測出鄰近星系與地球的距離,再由此標定紅移與距離的關系,就可求得宇宙的年齡。

            世界末日存在嗎宇宙的壽命有多長

            由此可知,關鍵是測出鄰近星系與地球之間的距離。測量地球與鄰近星系之間距離的方法有兩種,但兩種方法最終求得的宇宙年齡都在100億~200億年之間,這就是宇宙存在的年限。

            不少科學家對宇宙壽命為100億~200億年之間的理論提出了異議。英國著名物理學家斯蒂芬·霍金認為,宇宙將無限膨脹下去。按霍金的說法,宇宙始于懸浮在一片沒有時間的真空的豌豆大小的極密物體。簡而言之,宇宙有始無終。

             

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