The Snake Nebula, silhouetted against ancient stars massed near the nucleus of our galaxy, which is about 25, 000 light years away.

蛇形星云，它的轮廓与聚集在我们星系中心的古老恒星逆向，约25,000光年远。

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The observations showed that there are two kinds of neurons (dark and light) in the arcuate nucleus which might be responsible for producing both dopamine and releasing hormones.

观察结果表明：在弓状核内有暗细胞和亮细胞两种神经元，它们可能兼具产生多巴胺和释放激素的功能。

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The nucleus of light cells were larger than that of dark cells.

亮细胞和移行细胞的细胞核明显大于暗细胞。

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Nothing happened when they turned on the light in cells in an area of the brain called the subthalamic nucleus.

VOA: special.2009.04.07

If dark matter particles exist, scientists say, they should be able to observe a small amount of light given off when they hit the nucleus of a xenon atom.

VOA: special.2009.07.21

The principle behind these experiments is that particles hitting the xenon cause the nucleus of the atom to give off a little bit of light.

CNN: How particle smasher and telescopes relate

That means its nucleus has a stronger positive charge and that, in turn, means the electrons orbiting the nucleus are more attracted to it and travel faster, at roughly 60% of the speed of light, compared with 35% for the electrons orbiting a tin atom.

ECONOMIST: Einstein and car batteries