Start Unreliability of carbon dating

Unreliability of carbon dating

The Crab Nebula was identified as the supernova remnant of SN 1054 between 19, at first speculatively (1920s), with some plausibility by 1939, and beyond reasonable doubt by Jan Oort in 1942.

The nebula and the pulsar that it contains are some of the most studied astronomical objects outside the Solar System.

It is one of the few Galactic supernovae where the date of the explosion is well known.

The Crab Nebula is easily observed by amateur astronomers thanks to its brightness, and was also catalogued early on by professional astronomers, long before its true nature was understood and identified.

When the French astronomer Charles Messier watched for the return of Halley's Comet in 1758, he confused the nebula for the comet, as he was unaware of the former's existence.

This deduction was subsequently refined, which pushed Mayall and Jan Oort in 1942 to analyse historic accounts relating to the guest star more closely (see § Historical records below).

These new accounts, globally and mutually concordant, confirm the initial conclusions by Mayall and Oort in 1939 and the identification of the guest star of 1054 is established beyond all reasonable doubt.

It is located in the sky near the star Zeta Tauri (ζ Tauri).