The radius of the Crab Nebula is approximately 5.225 × 1013 kilometers. Use the conversion factor 1 light-year = 9.5 × 1012 kilometers to find the radius in light-years.

Using the above conversion

9.5 x 10 ^12kilometers = 1 light year

Therefore 5.225 x 10^13 will be

5.225 x 10^13/ 9.5 × 10^12 × 1 light year

= 5.5 light years

The radius of the Crab Nebula is

5.5 light years.

Hope this helps

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