An image of Abell 21, a planetary nebula, has been uploaded

Hi all,

An image of Abell 21 has been uploaded. It is a quite deep image, showing not only the classic crescent shaped bright hemisphere, but also the faint one, so that this nebula can be considered “spherical” rather than crescent-shaped.You can find it as well as some more info at:

Abell 21. Medusa Nebula

Enjoy,
Josep