These objects would have gravitationally interacted with one another, tugging at each other's orbits until they collided, growing larger until the four terrestrial planets we know today took shape.
这些天体互相产生重力作用，互相拖动对方的轨道直到它们相撞，长得更大，直到最后我们今天所知的4个类地行星初具雏形。