The Helix Nebula, designated NGC 7293 and also catalogued as Caldwell 63 (*), is a remarkable planetary nebula in the constellation Aquarius. It was discovered by Karl Ludwig Harding, probably before 1824…Read more
The Helix Nebula, designated NGC 7293 and also catalogued as Caldwell 63 (*), is a remarkable planetary nebula in the constellation Aquarius. It was discovered by Karl Ludwig Harding, probably before 1824…Read more
