Travel to the planetary systems of other stars is a much more formidable undertaking. 要航行到其他恒星的行星系中去是件极难实现的事。
Astronomers today announced the discovery of another planet orbiting a distant star, making it the most crowded planetary system outside our own. 天文学家今日宣布发现另一个绕遥远恒星飞行的行星,它是一个最多的行星系中的一员,而不是我们这个行星系。