They discovered almost 800 Cepheid variable stars, a special class of pulsating star used for accurate distance measurement.

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。

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The SHOES team used Hubble's Near Infrared Camera and Multi-Object Spectrometer (NICMOS) and the Advanced Camera for Surveys (ACS) to observe 240 Cepheid variable stars across seven galaxies.

SHOES团队使用哈勃望远镜的近红外相机和多目标光谱仪(NICMOS)、高级巡天相机(ACS)观测了综括7个星系的240颗造父变星。

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Cepheid variable stars are stars whose brightness changes at regular periods.

VOA: special.2009.04.29