The stars are known as Cepheid variables.

这些恒就是知造父。

There are more than a thousand known cataclysmic variables.

已知激超过一千种。

The system belongs to a kind of binary star known as cataclysmic variable.

该系统属于一种被称为激双。

Only 12 or so have orbital periods below 75 minutes.

只有12种左右激拥有低于75分钟轨道周期。

Skowron explained that Cepheids are giant stars that are far brighter than the sun.

斯考伦解释说，造父是比太阳明亮得多超巨。

And... And right in the middle, there's a variable star that I discovered.

而… … 而在正中央有一颗所发现。

They observed variable stars in the Andromeda Galaxy that allowed them to get the distance to the galaxy.

他观测了仙女座系中，这使得他能够到达系距离。

And it was, in fact, a variable star.

事实上，它是一颗。

" Var" here stands for " variable." Hubble had found a variable star in the Andromeda Nebula.

“Var”在这里代表“”。哈勃望远镜在仙女座云中发现了一颗。

And since there were pulsating Cepheid stars whose actual distances we already knew, this let us build a cosmic measuring stick.

既然已经知道这些有规律脉动造父实际距离，这就给造出一把宇宙测量尺。

Cepheids are quite rare, but at least one of them is well known to us—Polaris, the pole-star, is a Cepheid.

造父非常罕见, 但至少其中一颗是所知 - - 极北极就是造父。

Now if two Cepheid stars are pulsating at the same rate, and one's dimmer than the other, that means one is actually farther away.

如果两个造父以相同速率脉动，并且其中一个比另一个更加暗淡，这就意味着更暗那个更远。

I observe from seven or eight till about two in the morning, with a view to my great work on variable stars.

从七八点观察到凌晨两点左右， 以期完成在方面伟大工作。

If two Cepheid stars are pulsating at the same rate, and one's dimmer than the other, that means one is actually farther away.

如果两颗造父以相同速率脉动，并且一颗比另一颗暗， 这意味着一颗实际上距离更远。

It was the review of a pamphlet by an American astronomer, in which the author announced a conclusive discovery with regard to variable stars.

那是一位美国天文学家对一本小册子评论，作者在书中宣布了关于一个结论性发现。

She noticed that a type of star known as a Cepheid variable (after the constellation Cepheus, where it first was identified) pulsated with a regular rhythm-a kind of stellar heartbeat.

她注意到，有一种名叫造父（以仙王座命名，第一颗造父就是在那里发现）恒在有节奏地搏动——一种体“心跳”。

Actual variable stars do exist, but Tabby's Star doesn't fit that profile, it's what's known as an F-type main-sequence star, and shouldn't behave anything like this.

实际确实存在， 但 Tabby's Star 不符合这种情况，它是所谓 F 型主序， 不应该有这样行为。

In the early 1900s, astronomer Henrietta Swan Leavitt realized a class of stars called Cepheids pulsate, bright and dim, and every Cepheid that pulsates at the same rate has the same brightness.

1900 年代早期，天文学家 Henrietta Swan Leavitt 发现一系列名为造父，它有规律地亮和暗，并且每个造父以相同速率脉动就会有着相同亮度。

'I have made an amazing discovery in connexion with the variable stars, ' he exclaimed. 'It will excite the whole astronomical world, and the world outside but little less.

“在方面有了惊人发现，”他惊呼道。 “它会激发整个天文界兴奋，而外面世界却不会那么兴奋。”

'I am preparing a work on variable stars. There is one of these which I have exceptionally observed for several months, and on this my great theory is mainly based.

“正在准备一部关于作品。其中之一是几个月来特别观察到，伟大理论主要基于此。