The Helix Nebula (also known as NGC 7293 or Caldwell 63) is a planetary nebula (PN) located in the constellation Aquarius. Discovered by Karl Ludwig Harding...

The Eskimo Nebula (NGC 2392), also known as the Clown-faced Nebula, Lion Nebula, or Caldwell 39, is a bipolar double-shell planetary nebula (PN). It was...

NGC 3100, NGC 3275, NGC 3281, NGC 3347 and NGC 3449. NGC 6782 – another multiringed galaxy HST image of NGC 3081 NGC 3081 by 2MASS "NASA/IPAC Extragalactic...

The Ring Nebula (also catalogued as Messier 57, M57 and NGC 6720) is a planetary nebula in the northern constellation of Lyra.[C] Such a nebula is formed...

The Dumbbell Nebula (also known as the Apple Core Nebula, Messier 27, and NGC 6853) is a planetary nebula (nebulosity surrounding a white dwarf) in the...

NGC 3009 is a lenticular galaxy in the constellation of Ursa Major. It is about 35 thousand light years across, and with a recessional velocity of 4,445...

NGC 3302 is an unbarred lenticular galaxy in the constellation Antlia. It was discovered by the astronomer John Herschel on January 28, 1835. "NGC 3302"...

NGC 2663 (also known as PGC 24590) is an elliptical galaxy with a gaseous disk located in the constellation Pyxis. It is 93 million light years away from...

NGC 3301, also known as NGC 3760, is a lenticular galaxy in the constellation Leo. Its apparent magnitude in the V-band is 11.1. It was first observed...

"Knots in Nearby Planetary Nebulae". Astronomical Journal. 123 (6): 3329–3347. Bibcode:2002AJ....123.3329O. doi:10.1086/340726. "The icy blue wings of...