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ρ

ρ

ρ

1

a So , as I 've said, if I set rho equals a , that will be just a sphere of radius a centered at the origin .

我已经说过了，如果把 ρ 设为，就得到一个以原点为球心的球面。

2

I could have put a rho but I want to emphasize the fact that here it is going to be a constant .

我本来可以用 ρ 来表示，但在这我是想强调，它是一个常数。

3

The clouds surrounding the star system Rho Ophiuchus compose one of the closest star forming regions .

包围着蛇夫 ρ 恒星系统的星云构成了距离我们最近的恒星形成区之一。

4

I mean, very often, if the origin is in your solid, then rho will start at zero . Then you want to know when you exit.

很多时候，如果原点包含在你给定的固体中，那么 ρ 的值将从 0 开始，那么要知道什么时候离开。

5

Rho Ophiuchus itself is a binary star system visible in the light-colored region on the image right .

蛇夫 ρ 本身是一个双星系统，在上面照片的右边浅色区域可见。

6

So these two together , l times rho, give us mass per unit area .

这两个量，l 乘以 ρ ，一起给出单位面积上的质量。

7

Remember that rho is the distance from the origin .

记住 ρ 是到原点的距离。

8

You just plug in a rho equals a.

只需要插入一个等于 a 的 ρ

9

So it's mass per unit volume .

所以 ρ 代表单位体积的质量。

10

OK, so we will get, sorry, a becomes rho now .

我们得到。。。，a 现在变成了 ρ

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