What dark energy is, though, is a mystery.

然而暗能量是什么，仍然是个谜。

Dark energy, however, is an unknown unknown.

但是，暗能量却是一个未知的未知。

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。

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

什么是暗物质，暗能量，重力？

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。

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。

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。

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。

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

用暗物质弯曲时空[点此查看]

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。

But that assumption leaves a little daylight in the new case for dark energy.

但是这个假设却在暗能量的例子中留下了一点瑕疵。

Dark energy is a mysterious force that speeds up the expansion of the Universe.

暗能量是一种神秘的力量，它加速了宇宙的膨胀。

If dark energy is an inherent part of space, the density should remain constant.

如果暗物质能量是宇宙固有的一部分，那么他的质量应该是恒定的。

Scientists attribute the phenomenon to dark energy, a force that repels gravity.

科学家将这个现象归因于暗能量——与万有引力相抵触的一种力。

An equally intriguing possibility is that dark matter interacts with dark energy.

同样引人入胜的是暗物质有可能与暗能量相互影响。

Understanding the nature of dark energy is one of the biggest problems in science.

探究暗能量的本质是自然科学最大的难题之一。

What is known is that dark energy constitutes about three quarters of the Universe.

我们唯一知道的是宇宙的四分之三由暗能量所组成。

Much effort focuses on how the density of dark energy changes as space expands.

很多精力都集中在研究宇宙膨胀过程中暗物质密度如何变化。

We've had all kinds of surprises: dark matter, dark energy, inflation, things like that.

我们有过各种各样的惊喜：暗物质，暗能量，宇宙膨胀，诸如此类的事情。

The finding may help shed light on an even more bizarre aspect of the universe? Dark energy.

这一发现可能能够对于解释宇宙中更奇异的存在——暗能量有所帮助。

Dark energy creates a repulsive force that counters gravity and is now tearing apart space-time.

暗能量产生一种与万有引力相反的排斥力，这种排斥力推动着宇宙膨胀。

One possibility is there is no dark energy, and gravity works differently than scientists think.

一种可能性是暗能量不存在，而万有引力以一种与科学家认为的大相径庭的方式起作用。

And the prime evidence for dark energy doesn't come from the cosmic microwave background, either.

而暗能量的首要证据也并非来自宇宙微波背景。

Overall, dark energy is thought to contribute 73 percent of all the mass and energy in the universe.

总的来说，一般认为暗物质占据了宇宙中73%的质量和能量。

The lack of a good explanation for dark energy hasn't seemed to dampen scientists' enthusiasm for it.

缺乏对暗能量的完善解释似乎并未浇熄科学家的热情。

So far, one of the biggest challenges for dark energy researchers is marrying observations to theory.

迄今为止，暗能量研究人员面临的最大挑战是把观测到的现象与理论紧密联系起来。

If dark energy does exist, then it ultimately causes the expansion of the Universe to accelerate.

如果说暗物质真的存在，那将最终导致宇宙膨胀速度的加快。

It is hardly surprising that something called dark energy is hard to study. It is important, though.

一种叫暗能的东西很难研究，这并不足为奇，尽管它很重要。

Salamon also stressed that current NASA missions have already played a key role in measuring dark energy.

萨拉蒙还强调当前的美国国家航空航天局任务在暗能量测量方面发挥了重要作用。

This is to pin down dark matter and dark energy-the 95% of the universe the Standard Model doesn't explain.

这场较量的目的是理解暗物质和暗能量——在宇宙中占95%却无法用标准模型解释。