On the other hand, a comparatively warm body with a small surface gravity, like Earth's moon, is unable to hold even the heaviest gas and thus lacks an atmosphere.

另一方面，像地球的卫星这种相对温暖、表面引力较小的天体，它们连最重的气体也无法容纳，因此也没有大气层。

youdao

The Sun, Moon, and the planets formed from a huge spinning gas cloud that collapsed into a gyrating disc.

太阳、月亮和这些星球形成于倒塌进一个旋转盘状物的一团巨大旋转汽云。

《柯林斯英汉双解大词典》

That moon would have interacted with a disk of gas surrounding Saturn at the time, dragging its orbit closer and closer.

这颗卫星在那时可能与土星外的气态光环发生了作用，造成它的轨道越来越靠近土星。

youdao

New Mexico Gov. Bill Richardson, a Democrat, touted an "Apollo program" -- referring to the 1960s effort that put men on the moon -- that would reduce dependence on foreign oil by more than half and reduce greenhouse gas emissions by 80 percent.

CNN: Have we reached the energy tipping point?

By observing the cloud of dust and gas kicked up by each impact, scientists knew they could obtain valuable data about the Moon's composition.

BBC: Nasa reveals new information about moon probes crash sites