造父变星

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。

To send messages using a Cepheid, Learned and his colleagues suggest that extraterrestrials might change the star's cycle.

Learned和他的同事们提出要用造父变星来传递信息，外星人可以改变它的周期。

John Learned at the University of Hawaii in Honolulu and his colleagues think that signals could be sent by manipulating Cepheid variable stars.

位于火瑙鲁鲁的夏威夷大学的John Learned和他的同事们认为信号可以通过操纵造父变星来传递。

His first great discovery was made when he recognized a Cepheid variable star.

他识别出造父变星，做出了第一个重大发现，在仙女座星云的外围区域。

This property can be used to reveal the distance to a cepheid's parent galaxy, because the star's period reveals its intrinsic brightness.

这一特性可以用来测算出一造父变星与其源星系之间的距离，因为变星的周期能显示出其内在亮度。

Such stars periodically wax and wane in brightness: the longer a cepheid's period the bigger and brighter it is.

这类星的亮度有周期性盈亏：周期越长，该造父变星体积就越大，亮度也越高。

Hubble observations of pulsating stars called Cepheid variables in a nearby cosmic mile marker, the galaxy NGC 4258, and in the host galaxies of recent supernovae, directly link these distance indicators.

哈勃望远镜观测了一个近距离的星系NGC 4258中一类被称为造父变星的脉动变星和当前的超新星，直接比对了这些距离指示器。

Another refinement of our ladder is the fact that we have observed the Cepheids in the near-infrared parts of the electromagnetic spectrum where these variable stars are better distance indicators than at optical wavelengths.

我们这些距离台阶的另一个改进是：我们已经观测了造父变星的近红外波谱，这些变星在红外电磁波段的量天尺性能比可见光波段更好。

At this distance some non-variable stars may by chance appear to grow brighter and fainter in the same fashion as Cepheids due to the physical impossibility of perfect measurements of such dim objects.

在这个距离上，由于仪器的物理测量极限，测量不可能在完全理想状态下进行，某些非变星也会显得有时亮有时暗，就如同造父变星的模式似的。

Because NGC 4603 is much farther away than the other galaxies studied with Hubble by the Key Project team, 108 million light-years, its stars appear very faint from the Earth, and so accurately measuring their brightness, as is required for distinguishing the characteristic variations of Cepheids, is extremely difficult.

由于它远在1.08亿光年外，远超项目组团队研究的其他星系，故此恒星变得非常黯淡，而任务要求必须正确测定其中的特定变星——造父变星——的光度，显得格外困难。

What are your goals and strategies for growth?

你的成长目标和策略是什么？

And unto the angel of the church in Sardis write; These things saith he that hath the seven irits of God, and the seven star I know thy works, that thou hast a name that thou livest, and art dead.

3：1 你要写信给撒狄教会的使者，说，那有神的七灵和七星的，说，我知道你的行为，按名你是活的，其实是死的。