其之所以重要是因为它们发出有规律的光脉冲，而且这些脉冲的周期与该星的亮度精确对应。

These are important because they produce regular pulses of light and the period of those pulses is precisely related to the luminosity of the star.

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但当X射线脉冲通过后星云就暗淡下来回到通常的亮度。

But after the X-ray pulse passes through, the cloud fades to its normal brightness.

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太阳脉冲，一个太阳能高亮度新航飞机原型，苍蝇在第一夜近佩耶纳机场，飞行尝试靠近勃朗峰山脉瑞士2010年7月7日。

The Solar Impulse, a solar-powered HB-SIA prototype airplane, flies near the Mont-Blanc mountain during its first night flight attempt near Payerne airport, Switzerland July 7, 2010.

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