There is more stuff in the space than we can see, and that the gravity of this stuff is holding everything together.
宇宙中存在着比我们所能看到的更多的物质，而这些物质的重力将所有的东西都聚集在一起。
There is more stuff in the space than we can see, and that the gravity of this stuff is holding everything together.
宇宙中存在着比我们所能看到的更多的物质，而这些物质的重力将所有的东西都聚集在一起。
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