Since the pulsar's regular radio and X-ray pulses have not altered, researchers suspect that the fluctuations originate in the inner portion of the nebula.

鉴于脉冲星规律的射电及X射线脉冲并未发生改变，因此学者们怀疑波动源自于星云的内层。

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I called my radio astronomy friends yesterday and I asked them, "What is the rotation period of the neutron star in the Crab Nebula?"

我昨天打电话问我，射电天文学的朋友，中子星在蟹状星云的，旋转周期是多少。

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The nearest bit of the nebula, though, is a mere 1, 200 light years away and the two radio telescopes can detect radio signals from a portion of it that is 8 light minutes (150m kilometres or 90m miles) across.

ECONOMIST: Pulsars: In a wink | The