If the asteroid had a radius of 1.75 meters, then in order to have Earthlike gravity at the surface, it would need to have a mass of about 500 million tons. This is roughly equal to the combined mass of every human on Earth.
如果小行星半径1.75米，那么它得有5亿吨重才能拥有像地球那样的表面重力，这差不多相当于地球上所有的人加起来那么重。
9． If you stood on the surface, you 8217;d experience tidal forces. Your feet would feel heavier than your head, which you 8217;d feel as a gentle stretching sensation. It would feel like you were stretched out on a curved rubber ball, or were lying on a merry-go-round with your head near the center.The escape velocity at the surface would be about 5 meters per second. That 8217;s slower than a sprint, but still pretty fast. As a rule of thumb, if you can 8217;t dunk a basketball, you wouldn 8217;t be able to escape this asteroid by jumping.
如果你站在星球表面，那么你就会感受到潮汐力。你的脚会感觉比头更“重”一些，你的感觉就像是被拉伸了一样：就像你躺在橡胶球的弯曲表面上，或者你躺在旋转木马的地上，并且头靠近中心。星球表面的逃逸速度约为每秒5米。这个速度比百米冲刺要慢，但其实还是挺快的。作为经验估算，如果你没法扣篮，那么你就不能通过竖直起跳的方式逃离这颗星球。
However, the weird thing about escape velocity is that it doesn 8217;t matter which direction you 8217;re going. If you go faster than the escape speed, as long as you don 8217;t actually go toward the planet, you 8217;ll escape. That means you might be able to leave our asteroid by running horizontally and jumping off the end of a ramp.
但逃逸速度诡异的地方在于，无论你朝哪个方向前进，只要你跑得比逃逸速度快，并且你不是正冲着地面而去，那么你就能逃出这颗星球。这意味着你可以通过水平跑动，并在坡道的尽头起跳的方式离开这颗星球。
If you didn 8217;t go fast enough to escape the planet, you 8217;d go into orbit around it. Your orbital speed would be roughly 3 meters per second, which is a typical jogging speed. But this would be a weird orbit.
如果你的速度没有高于逃逸速度，那么你就会进入环绕它的轨道中去。你的轨道速度大约在每秒3米左右，也就是平常慢跑的速度。只是这个轨道显得有些奇怪……