Right now, galaxies are merrily churning away, converting nebular gas into stars.

现，系正愉快旋转着，云气体转化为恒。

A few billion years after the nebular gas runs out the only stars left will be those long-lived red dwarfs.

云气体耗尽几十亿年后，剩下的恒那些长寿的红矮。

Unless the solar wind blew all the nebular particles far away from the planet.

除非太阳风把所有的云粒子都吹到远球的方。

In 1873 French scientist, Edouard Roche proposed that the Moon simply formed alongside the Earth out of essentially the same nebular cloud of particles and gasses.

1873年法国科学家爱德华·洛希提出月球只球旁边形成的，本质上由相同的粒子和气体的云构成的。

Scientists have had a basic understanding of how the solar system formed since at least 1755, when the philosopher Immanuel Kant proposed the nebular hypothesis.

至少从 1755 年哲学家伊曼纽尔·康德 (Immanuel Kant) 提出云假说开始，科学家们就对太阳系的形成有了基本的了解。

But, if we trust the nebular model, and believe they evolved out of the same disk as Earth, something must have happened to make them that way.

但，如果我们相信云模型， 并相信它们从与球相同的圆盘中进化而来的，那么一定发生了什么事情使它们变成了这样。

The nebular model tells us that, back when Mars was forming, there should have been enough material in Mars's part of the disk for it to grow much larger.

云模型告诉我们， 火形成时，火圆盘部分应该有足够的物质让它变得更大。