宇宙中的许多物体是看不见的，但它们发射无线电波。
Many objects in the universe are invisible, but they send radio waves.
对对宇宙中到处都有人们看不见的物质这种观点——这种物质可以轻松地穿过差不多所有物体而不被人察觉——很难让人接受。
That the universe is filled with matter people cannot see-matter that simply passes through pretty much everything undetected-is hard to accept.
暗能量占据了我们宇宙的四分之三，然而又是完全看不见的。我们只能根据它对宇宙膨胀所起的作用来认识到它的存在。
Dark energy makes up three-quarters of our Universe but is totally invisible. We only know it exists because of its effect on the expansion of the Universe.
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