A Complete Collection of 100000 Whys
Fav十万个为什么
为什么宇宙有引力？
1、引力是宇宙的基本力之一，由爱因斯坦的广义相对论解释，即质量导致时空弯曲，物体在弯曲的时空中沿最短路径运动，表现为引力。
2、根据牛顿的万有引力定律，任何两个物体之间都存在相互吸引的力，这种力与物体的质量成正比，与距离的平方成反比。
3、引力使得行星围绕恒星旋转，恒星组成星系，星系又组成星系团，形成了宇宙的宏观结构。
4、引力是宇宙中物质聚集和形成天体的主要原因，没有引力，宇宙中的物质将无法形成稳定的结构，如行星、恒星等。
5、引力不仅影响宏观物体，也影响微观粒子，如电子绕原子核运动，展示了引力的普遍性。
总之，引力是宇宙的基本现象之一，由质量和能量的存在导致时空弯曲而产生，是宇宙结构和运动的基础。
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