The Crab Nebula Is About 10 Light-Years Across and Its

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The Answer is If the "radius" of about 5 ly (recall that 1 ly =9.46 * 10¹² km)has been covered at a rate of about 1,500 km/s in about (5 * 9.46 *10¹² km)/(1,500 km/s)= 3.15 * 10¹⁰ s,that would translate to about 1,000 years of expansion,in agreement with the time elapsed since 1054.(A caveat should be pointed out,however.Considering that at the moment of the stellar explosion the ejected layers could have started at 30,000 km/s and scientists presently measure about 1,500 km/s,the average speed could be quite uncertain-it may be significantly larger than 1,500 km/s-and hence our rough estimate is a nice coincidence.)

The Crab Nebula Is About 10 Light-Years Across and Its

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The Crab Nebula Is About 10 Light-Years Across and Its

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