The distance to the Crab Nebula is two kiloparsecs (R ≈ 2 kpc). In the Crab Nebula, a supernova exploded in 1054. How many years ago did the Supernova of 1054 explode?
The distance to the Crab Nebula is R ≈ 2 kpc ≈ 6520 sv. years old. 950 years have passed since 1054. 6520 + 950 = 7470 years, so more than 7 thousand years have passed since the star exploded, shedding its shell. It makes no sense to talk about greater accuracy.
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