他们发现了差不多800个造父变星，一种用于准确测量距离的特殊变星。
They discovered almost 800 Cepheid variable stars, a special class of pulsating star used for accurate distance measurement.
哈勃太空望远镜(HST)拍摄的壮丽的漩涡星系ngc 4603，现今发现一类特殊的变星——造父变星的最远的星系。
NASA Hubble Space Telescope (HST) view of the magnificent spiral galaxy NGC 4603, the most distant galaxy in which a special class of pulsating stars called Cepheid variables have been found.
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