NGC 2736 often termed the pencil nebula due to its fine filament lines is a small part of the Vela supernova remnant from a supernova explosion that occurred around 11,000 years ago.
This image is a high resolution two panel mosaic showing the detail of the filamentary structure.
Imaged in LRGB Ha and OIII on my Planewave CDK 1000 at Observatorio El Sauce, Chile.
Full resolution image is here
Image Acquisition and Processing: Mike Selby