The Crab Nebula is about 10 light-years across and its glow is energized by the pulsar at its center, about 10 km in size.The shell of this nebula is expanding at almost 1,500 km/s.Estimate the age of the Crab Nebula.How does it reconcile with the documented records of a "guest star" from Chinese astronomers dating to 1054 CE?
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