The Complete Book of 100,000 Reasons Why
lit. ten thousand reasons why
为什么有重力现象？
1、重力是由质量引起的，任何有质量的物体都会产生引力，这种力会吸引其他物体向它靠近。
2、地球的质量非常大，因此它对周围的小物体产生明显的引力，这就是我们感受到的重力。
3、重力与距离的平方成反比，即物体之间的距离越大，重力越小；距离越小，重力越大。
4、重力是宇宙中普遍存在的现象，不仅地球有重力，其他行星、恒星甚至整个宇宙都受到引力的作用。
5、重力不仅影响物体的运动，还决定了天体的运行轨迹，如行星绕太阳旋转、卫星绕地球旋转等。
总之，重力是物体之间由于质量而产生的相互吸引力，它解释了为什么物体会下落、天体如何运行，是自然界的基本现象之一。
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