4 times wider than Earth is Neptune, a cold blue gas giant 49,500 km wide.

海王星的宽度是地球的4倍，它是一颗蓝色的冷气体巨行星，宽度为49500公里。

What you're looking at here is an artist's rendering of our own galaxy, the Milky Way, and it's enveloped in a halo of dark matter, represented here by a blue gas.

你在这里看到的是艺术家对我们自己的银河系的渲染，它被暗物质的光环所包围， 在这里以蓝色气体为代表。