What's great about the star in Taurus that went supernova in 1054 (some say it happened in june if Europeans are to be trusted, others say it was july 4 if the Chinese are to be trusted even if the story was reported a century after the event, in China) is that it became number one in Messier's list of nebulae (planetary and spiral) and meant to not mistaken them with comets.
Then in 1967, Jocelyn Bell hears a strong radio signal (that was dubbed Little Green Men because they thought for a while ET had said "hello") that was called "Pulsar" and turns out to come from the Neutron star.
She never got the Nobel prize for physics, though she deserved it.
There was years ago a great BBC documentary about this detective story.
It's called the Crab Nebula, but there's another one that looks much more like a crab. I don't remember its name, so I can't google on it.

Raoul