Solar System's 'look-alike' found.Astronomers have discovered a planetary system orbiting a distant star which looks much like our own. 发现太阳系样星系.
Conversely, astrometry works best when a planetary system is "face-on" when seen from Earth, because then the star's movements in the orbital plane are most pronounced. 与之相反，从地球看去行星系统是“面向”的时候天体测量最有效，因为此时恒星在轨道面上的运动最显著。
It is reasonable to suppose that other stars are also attended by planetary system. 有理由猜测别的恒星也伴有行星系统。
Comets are building stones of the planetary system that we can still observe in their almost original state . 欧洲南部天文台的霍曼·贝哈特为《科学》杂志上的研究报告撰写了评论。
The result is called, somewhat misleadingly, a planetary nebula. 这个结果称为行星状星云，这是个常让人误解的名字。