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1·What dark energy is, though, is a mystery.

然而暗能量是什么，仍然是个谜。

2·Dark energy, however, is an unknown unknown.

但是，暗能量却是一个未知的未知。

3·Dark energy is a more daunting problem still.

暗能量依旧是一个更加令人却步的问题。

4·What is dark matter, dark energy, gravity?—stem

什么是暗物质，暗能量，重力？

5·Dark energy is possibly even more baffling than dark matter.

暗能量大概要比暗物质更让人无头绪。

6·Dark energy basically works against gravity in a tug-of-war.

大体上，暗能量在与引力展开一场拉锯战。

7·These mysterious substances are called dark energy and dark matter.

这些神秘物质称为暗物质与暗能量。

8·The most likely reason: a mysterious cosmic force known as dark energy.

最可能的原因就是：诸如暗能量等神秘的宇宙作用力。

9·Warping spacetime with dark energy is one solution [view slideshow]

用暗物质弯曲时空[点此查看]

10·Matter, energy and dark energy all produce curvature in space-time, however.

而事实上，物质、能量和暗能量在时空中都会产生弯曲。