地球无论是大小、与太阳的距离还是环境，都恰到好处地孕育出千奇百怪、纷繁复杂的大自然和我们这个样子的人类，不过，行星有大有小，假如地球变大了一倍，地球上的一切，包括自然环境和生命会发生怎样的改变？

人变得更重更矮

如果地球的密度不变，体积增大了一倍，那么地球的质量就会增大一倍，致使引力也增大，而人类目前的身体结构难以承受这么大的力量，只有降低身高，增加骨头的密度，才能维持身体的平衡，所以人类会比现在更矮、更重。相应地，人类的运动速度也会减缓许多，我们可能会变得更容易累，更不爱运动了。

气温升高，水分蒸发

地球增大一倍，就意味着它的直径增大了33%，地球表面距离太阳更近，那么地球受到的太阳辐射会越来越强，热量增大，气温就会升高，有科学家估计地球的平均气温将上升20℃。同时，地球上的水分也会蒸发得越来越快，生物们赖以生存的水资源减少，它们就会面临死亡的威胁。经过观测，许多比地球大好几倍的行星与各自恒星的距离都和水星与太阳的距离相近，如果我们的地球离太阳也那么近，那么地球上所有的水分都会蒸发掉。

磁场被削弱

地球最中心的地方叫地核，地核分为内核固体圈和外核液体圈，均含有较多的铁元素，而地球主要通过外核圈层的液体对流产生磁场。如果地球增大，地核也会增大，它与地球表面物体之间的引力增大，这样一来，对流的液体可能会收紧凝固，流不动了，磁场就会减弱甚至消失，对生命将十分不利 。

磁场消失，太阳风将肆虐

太阳会时不时放出强烈的辐射，这被称为“太阳风”，太阳风实际上是数不清的带电粒子辐射。

正因为地球有磁场，这些带电粒子会受到其干扰，被迫朝其他方向飞散，有一部分会顺着地球的两极滑去，在地球南北两极形成绚丽多彩的极光，其余大部分会分流到周围的太空中，不会对地球造成太大的影响。

然而，地球磁场一旦消失，地球就没了保护层，太阳风暴便会肆虐地吹向地球。太阳风辐射到生物体后，会破坏生物细胞的DNA，增加患癌的风险。太阳风还会吹走一部分大气，使大气层变薄，生物呼吸会变得困难；而且大气也有遮挡辐射的功能，大气的部分散失会使生命受到更多辐射的伤害，甚至死亡。

更活跃的火山喷发

地球变大的同时，地球内部空间也在变大，会有更多能量在那里聚集，导致更剧烈的内部运动。而能量要往外溢出，就会产生更加频繁的火山喷发。不仅有巨大的热量涌出地表，使地球温度升高，还会有很多微粒尘埃进入大气，遮挡阳光，使地球上的植物无法进行光合作用，无法产生氧气和营养，并逐渐死去；以植物为食的动物们也慢慢失去了食物，就像当年恐龙一样纷纷灭绝。

如此看来，假如地球变大，地球上的环境将不利于生命生存。

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