Vela supernova remnant

The Vela supernova remnant is a supernova remnant (SNR) about 900 light-years away for a supernova that would have become visible to Earth about 12,000 years ago. It is one of the nearest known SN remnants and is very bright in X-rays. In the sky, it overlaps a more-distant SNR, Puppis A. I believe the first noting of it was specifically of a nebula that forms part of it, which is labeled NGC 2736 or the Pencil Nebula.