And in those 50 years, not only did we literally, physically set foot on the moon, but we have dispatched robotic spacecraft to all the planets -- all eight of them -- and we have landed on asteroids, we have rendezvoused with comets, and, at this point in time, we have a spacecraft on its way to Pluto, the body formerly known as a planet.
在这50年间，人类不仅迈向月球， 还向所有8个行星发送机器人， 我们的足迹遍布小行星，我们还同彗星有亲密接触， 现在，我们正有一个飞船驶向冥王星， 过去冥王星也被认作行星之一。