科学家猜测外星人样貌 是否真实仍未可知
我们已经在各种各样的好莱坞电影中看到过对外星人的描述，但是哪一个更接近于真实的外星人呢？随着我们对 宇宙 的不断理解，科学家们开始推测这些外星人可能有着什么样的外貌。科学家们根据环境和生物学线索而不是科幻小说来形成自己的观点，因此观点必定非常多样。
科学家根据宇宙环境和生物学线索，对外星人容貌做出推测。
1、水母
为阿斯特里姆太空公司工作的Maggie Aderin-Pocock博士认为：“外星人可能是海洋型动物，它们借助光脉冲进行彼此交流，它们的身体能在阳光下变大，并借助金属表面吸收光线。它们通过晶状体观察周围环境，使用橙色底部进行伪装，浮力袋则能维持它们的深度。”她根据地球上的 生命 如何从海洋中起源的理论作出推断：外星 生物 与外星大气的交互方式类似于我们海洋中生物体与水交互作用的方式。
2、臭虫
臭虫由于它们厚重的外壳而成为地球上最难以毁灭的生物之一，它们能够在各种极端的条件中存活。强壮的外壳使臭虫一样的生命形式能够在我们宇宙的复杂环境中生存。
3、像人类一样
剑桥大学进化古生物学家Simon Conway Morris认为，外星人与人类不仅外表和生物学一样，弱点也非常相似，比如说贪婪、暴力而且倾向于开发他人的资源。Morris说道：“我认为达尔文进化论事实上完全可以预见，而且当你拥有生物圈而且发生进化时，那么共同的变化就会出现，智力也是如此。但是外星人像人类是一件好事还是一件坏事，还有待辩论。
4、非碳基生命
根据我们对于地球上生命的了解，我们完全可以理解为什么许多科学家都认同外星人与人类相似的观点。虽然地球上发现的大多数生物都是由碳、氢、氮、氧、磷和硫等元素组成，但是科学家们发现多细胞生物不需要氧气。这很明显会改变我们对于生命和生命存在方式的一些看法。目前的科学假设认为，非碳基生命能够存活于宇宙（主流观点是硅基生命形式），如果这个理论得到证实，那么有可能外星人与地球上的任何生命都不相同。
5、极端生物：深海和高空
英国伦敦大学的一位天体生物学家Lewis Dartnell博士，列举了来自与地球不同星球的几种可能的外星人形态。比如说，来自水世界的生物可能会像我们海洋中的生物体一样进化，而一颗强重力星球可能生活着更庞大而且更强大的飞行生物，它们利用浓密的大气飞行。
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