flat universe造句

A flat universe is also open
平坦而开放的宇宙。
However , physicists inclined to believe that the total mass of the universe will be " just right " , that means it is enough to stop the expansion of the universe at last but is not enough to pull it back . hence , the universe is neither closed nor open but a flat universe
不过，很多物理学家倾向相信宇宙中的物质质量不太多也不太少，膨胀会逐渐缓慢下来，但永远不会收缩，宇宙既非封闭也非开放，而是介乎两者之间的平面宇宙。
It's difficult to find flat universe in a sentence. 用flat universe造句挺难的