The distance to the Crab Nebula is about 6520 sv. years old. The Crab Nebula originated from the explosion of the Supernova, which was observed by astronomers in 1054. How many years ago did this explosion occur?
The distance to the Crab Nebula is R ≈ 2 kpc ≈ 6520 sv. years old. 956 years have passed since 1054. 6520 + 956 = 7476 years, so more than 7400 years have passed since the star exploded, shedding its shell like a Supernova. It makes no sense to talk about greater accuracy.
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