Quasar is short for quasi-stellar radio source.

类星体是“类似恒星射电源”的缩写。

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The most powerful such object is a quasar, which emits a huge amount of radio, infrared, ultraviolet, X-ray, and gamma-ray energy.

这种物体多数是一个发射巨大能量（包括射电、红外线、紫外线、X射线和伽玛射线在内）的类星体。

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Chris Carilli, of the National Radio Astronomy Observatory in Socorro, New Mexico, points out that the quasar-based method to measure the ancient value of alpha is at least 30 years old, and has never before resulted in a value different from today's alpha.

ECONOMIST: Fundamental physics