Because globular stars lack heavy metals, it's unlikely they would've formed planets like Earth.

因球状恒星缺乏重金属，们不太能形成像地球这样行星。

Globular clusters were a good clue that there was more going on.

球状星团是一个很好线索，说明还有更多秘密等待着我们去发掘。

Globular clusters are larger, have hundreds of thousands of stars, and are more spherical.

球状星团更大，有几十万颗恒星，而且更像球状。

It's producing so many stars that astronomers think it may be in the process of forming a globular cluster!

产生了如此多恒星，以至于天文学家甚至认能正在形成球状星团过程中！

In addition, Scott included another layer of signposts: pulsars in globular clusters orbiting the Milky Way.

此外，斯考特还查了另一层路标：绕行银球状星团里脉冲星。

Open, or galactic clusters, and globular clusters.

开放星团或疏散星团，以及球状星团。

Speaking of which, most of the globular clusters orbiting the Milky Way are in the halo.

说到这，大部分环绕银球状星团都在光晕之中。

“We don't know everything, but that doesn't mean we know nothing, ” reminds a globular character on a few occasions.

“我们不是什么都懂，但这不意味着我们什么都不懂。”

Unlike open clusters, though, globulars are old.

不过，与开放星团不同是，球状星团很古老。

First of all, the stars in a globular cluster aren't exactly like our good old Sun.

首先，球状星团中恒星并不像我们善良老太阳。

Type II Cepheids have been used to measure distances to the galactic center and globular clusters.

Type II 造父变星已被用于测量到银中心和球状星团距离。

Ancient clumps of stars that predate the Milky Way, globular clusters are gorgeous and mysterious, and they are veritable millisecond pulsar factories.

球状星团是比银更古老恒星团，既美丽又神秘，而且简直是制造毫秒脉冲星工厂。

We know this because in most globulars, the MOST massive stars are LESS massive than the Sun.

我们之所以知道这一点，是因在大多数球状星团中，质量最大恒星质量都比太阳质量小。

Natarajan: If those globular clusters like Pal 5 are further littered with black holes, the inventory just explodes, basically.

纳塔拉詹：如果像帕洛玛5号这样球状星团中散布着更多黑洞，那么这些黑洞数量就会激增。

Its features are similar to NGC 3201, a globular cluster with an entirely different evolution channel, making their comparison meaningless.

其特征与NGC 3201相似，NGC 3201是一个具有完全不同演化路径球状星团，因此们之间比较没有意义。

Notably, our galaxy contains over 150 globular clusters, while our neighboring spiral galaxy, Andromeda, hosts around 300 of them.

值得注意是， 我们银包含超过150个球状星团，而我们附近旋涡星——仙女座，则拥有大约300个这样星团。

This phenomenon has already been observed in globular clusters within the Milky Way.

这种现象已经在银内球状星团中被观测到。

Because globulars are so old, they contain a lot of dead stars.

因球状星团太老了，们包含了很多死亡恒星。

Astronomers were intrigued to investigate whether the same phenomenon observed in globular clusters also applies to high-redshift galaxies.

天文学家们感兴趣是调查在球状星团中观察到现象是否也适用于高红移星。

The stars in globular clusters tend to have less heavy elements in them too, which you expect if they're old.

球状星团中恒星往往也含有较少重元素，如果们很老话，这也是你所期望。