The theory is that there was this cloud in the galaxy that had the same composition of the Sun.

理论上那里有的星，和太阳的成分一样的。

Beyond the Eagle and Orion Nebulae, even larger star forming regions lie within the plane of the Milky Way.

除了老鹰和猎户座星，里存在更大的恒星生成区域。

The Large and Small  Magellanic Clouds are two examples of the Milky Way's satellites.

大麦哲伦星和小麦哲伦星是星星的两个例子。

If the spiral nebulae lie within the Milky Way galaxy, they are moving so fast relative to the rest of the galaxy that they cannot remain within it for long.

若螺旋星位于内，它们相对于其他部分的运动速度如此之快， 以至于无法长久地保持在内。

So if the cloud lies in the galactic halo, which is a roughly spherical collection of stars, it could be gas flung off by streams of stars there.

所以如果这个星位于晕中，晕是由大致呈球形分布的恒星组成的，那么它可能是由那里的恒星流抛射出的气体。

Harlow Shapley that the spiral nebulae were part of the Milky Way, and Heber D. Curtis that they were far beyond it.

哈洛·沙普利认为螺旋星是的一部分，而赫伯·D·柯蒂斯则主张它们远在之外。