For 100 years astronomers have paid particular attention to a class of variable star known as the Cepheids.
过去100年来，天文学家特别注意一类称作“仙王座变光星”的恒星。
And, since individual Cepheids are bright enough to be seen in other galaxies, they were the first tool used to estimate the distances to such galaxies.
且由于在另一个星系中的单颗“造父变星”的亮度就足于使其被观测到，所以它们是测算类似星系距离的首选工具。
Cepheids are a special type of star that pulsates in a predictable way, and like the type 1a supernova, they are assumed to be the same, no matter where they are located.
造父是种特殊的恒星，它能以可以预测的方式周期脉动，就像I型超新星，他们被当做是一样的，不管他们在那里。
Cepheids are reliable cosmic distance mileposts. The interval it takes for the Cepheid to complete one pulsation is a direct indication of the stars'; s intrinsic brightness.
造父变星是可靠的宇宙距离(测量)里程碑，其完整的一个光变周期直接反映了星体的本质光亮度。
With Hubble's powerful capabilities, the team was able to side step some of the shakiest rungs along the previous distance ladder involving uncertainties in the behavior of Cepheids.
有了哈勃望远镜的强大能力，团队就能直接跨过某些不稳定的台阶：（由于清晰度不够，）先前对这些造父变星行为的观测不是很准确。
With Hubble's powerful capabilities, the team was able to side step some of the shakiest rungs along the previous distance ladder involving uncertainties in the behavior of Cepheids.
有了哈勃望远镜的强大能力，团队就能直接跨过某些不稳定的台阶：（由于清晰度不够，）先前对这些造父变星行为的观测不是很准确。
应用推荐