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中子星是宇宙中最極端的星體之一

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它們就像一顆巨大的原子核

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直徑可以達數公里

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密度難以置信地高，而且十分殘暴

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這樣的東西為何會存在呢？

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一顆星的命運由兩個互相平衡的力主宰

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分別是它的重力

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以及其核聚變產生的輻射壓

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在恆星的核心
氫原子融合成氦原子

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氫原子將會漸漸被用完

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如果恆星的質量夠大
氦原子將會被融合成碳原子

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這龐大恆星的核心被分為幾層，就像洋蔥一樣

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越接近中心，積聚的原子核就越重

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碳原子被融合成氖後
再被融合成氧，接著成為矽

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最後，核聚變的反應到達鐵
它不能被融合成為其他元素

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當核聚變停止時
輻射壓將會急劇下降

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這顆恆星不再平衡

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如果核心質量超過 1.4 太陽質量
就會引致一場災難性的崩塌

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恆星核心外部以高達每秒70,000公里每秒向內崩塌

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現在，只剩下原子之內的基本力
來抗衡整顆行星的引力

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電子之間的量子斥力被克服後


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電子和質子融合成為中子

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被緊迫在原子核的距離下

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恆星的外層則會在超新星爆炸中被炸到太空四處

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這個成品就是「中子星」了！

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中子星的質量約為1至3太陽密度


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直徑卻壓縮成只有25公里闊

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有50萬倍地球的質量

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在這個大小有如曼哈頓的球之中

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中子星的密度很高


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1立方厘米的中子星和700米闊的鐵立方體質量相約

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即十億噸，等同珠穆朗瑪峰的質量


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卻只有方糖的大小

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中子星的引力也很驚人哦！

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如果你在距離表面1米放出一件物件

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該物件會在1微秒後著陸


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並加速至每秒720萬公里

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中子星表面十分平滑


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表面最多只有5毫米的高度誤差

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亦有一個超級薄的高溫等離子體大氣層

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表面溫度約開氏100萬度

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而太陽的表面只有開氏5,800度

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