All you've got to do is go a few hundred miles in that same direction and look back, and you won't see any walls or chemical scum at all -- all you see is a blue planet. And if you go further than that, you'll see the Sun, the solar system and the stars and so on, but that's still not typical of the universe, because stars come in galaxies.
你所要做得是，朝着同一个方向前行数百英里然后往回看， 你将根本不会看到任何墙或者化学污垢 -- 你所能看到是一个蓝色星球。如果你继续前行， 你会看到太阳，太阳系，以及恒星等等。 然而这在宇宙中仍然不算典型，因为恒星存在于星系中。