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          時光旅行

          推薦人: 來源: 美文閱讀網 時間: 2018-05-26 02:12
            平常所說的時光是什么呢?按照文人學子的話來說就是時間,但是站在物理學的角度來說能創造出時光這個詞的人便已經知道光速與時間之內必然存在著一種聯系。

            光速可以改變時間。說到這個,便會有人問:“光速與時間之間會有什么關系?光速就是光速,時間就是時間,在兩者之間沒有什么嘛”。但我們知道,光速是宇宙中的極限速度,光的速度可達到每秒18.6萬英里,任何物體任何物質永遠不可能超過光速。但有一點,物體一但超過光速,就能改變時間,就有了穿越時空的能力,到達未來,現在可能很難理解,但讓我們舉一個通俗易懂的例子。比如,一枚硬幣從高空落向水中,我們假設硬幣的速度超過了光速在迅速下落,那我們將會看到怎樣的景象呢?只會有一個景象,那便是先看到水花,而硬幣卻停留還在半空中。對于這個例子來說是很不現實的,第一是硬幣無法超過光的速度,第二是就算能超過光速,速度也非常之快,我們也無法真正們觀測到兩者之間究竟是誰快誰慢。但這種現象在超光速的情況下是可以實現的,硬幣超過了光速,這便說明硬幣已經穿越到了未來,我們所看到的是結果而不是過程。

            時間并不是恒定的,他會因速度的增大而改變。我們再假設有一艘飛船,它的燃料無限且它以超過光的速度行駛,那么飛船中的人只用一小會兒便可以達到幾十年甚至幾百年之后,如果在外面的人度過了100年,但在飛船中的人可能只會感覺到只過了一個星期左右。這便可以說明,飛船外面與里面時間的流逝是不一樣快的。

            質量可以改變時間。這一點可能大部分人都不清楚,質量越大的物體,在它旁邊物體的時間就會流逝的越慢,這種差距在地球上微小的如同發絲一般,若想有極其明顯的現象的話,質量必須非常大。還是舉一個通俗的例子,若有一個比太陽的質量還要大500萬倍的物體,一個人站在它的旁邊,另一個人站在離它非常遙遠的地方,相當于好幾千光年左右的距離,這時兩人同時開始計時,當同時停止計時時,在這個質量巨大的物體旁邊的人計時器中的時間會比另一個人計時器中的時間慢。偉大的物理學家和預言家霍金認為宇宙中質量巨大的黑洞就是能進行時間旅行的工具,從上述講的來看,這種想法未必是不現實的。

            在我們生活的宇宙之中時間與空間是相互交迭的。當物體的質量與速度不斷增加,其存在的時間和空間也將隨之變化。一個粒子,我們假設能將它加速直到超過光速,那么這個粒子的壽命將會增加幾十倍甚至幾百倍,這相當于粒子超過光速的那一瞬間穿越到了未來,我們才誤認為這個粒子的壽命增加了。對于這個問題,愛因斯坦也在相對論中有所指出,當我們以光速移動時,時間將不再流動,若超過光速,你所在的空間中時間也會相對變慢。

            現在在世界上已經有了超音速飛機,科技在一點點的發達,人類在一點點的進步,古時候的神話小說現在大多都已成為了現實。相信在不久的將來,時光旅行將不再是夢,它將會是人類歷史上的再一次進步。

            高一:一縷曙光
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