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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 , most likely before 1824, this object is one of the closest of all the bright planetary nebulae to Earth. [ 3 ]
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Enormous Lyα nebula (ELAN) Four quasars embedded in the nebula. Likely progenitor of a massive galaxy cluster at z=2.05. Fabulous Nebula [13] 969,000 ly (297,000 pc) [14] Enormous Lyα nebula (ELAN) Also called SDSS J1020+1040 nebula, after the central quasar (aka 4C 10.29), located at z=3.164. Inspiraling material. [14]
Helix Nebula: Planetary Nebula: 0.522 Aquarius: 7.3 C64 NGC 2362: Tau Canis Majoris Cluster: Open Cluster and Nebula: 5.1 Canis Major: 4.1 C65 NGC 253: Sculptor Galaxy: Spiral Galaxy: 9,800 Sculptor: 7.1 C66 NGC 5694 Globular Cluster: 113 Hydra: 10.2 C67 NGC 1097 Barred Spiral Galaxy: 47,000 Fornax: 9.3 C68 NGC 6729: R CrA Nebula: Nebula: 0.424 ...
NGC 2685 (also known as the Helix Galaxy) is a lenticular and polar ring Seyfert Type 2 galaxy in the constellation Ursa Major. Its velocity with respect to the cosmic microwave background is 1003 ± 9 km/s, which corresponds to a Hubble distance of 48.2 ± 3.4 Mly (14.79 ± 1.05 Mpc ). [ 1 ]
The Double Helix Nebula is a gaseous nebula in the direction of the constellation Ophiuchus, near the center of our galaxy. It is thought to have been distorted by magnetic torsion into the shape of two connected spirals, known as a double helix , which is akin to the shape of a DNA molecule.
[2] [35] Every nebula begins with a certain amount of angular momentum. Gas in the central part of the nebula, with relatively low angular momentum, undergoes fast compression and forms a hot hydrostatic (not contracting) core containing a small fraction of the mass of the original nebula. [38] This core forms the seed of what will become a star.
NGC 7008 (PK 93+5.2), also known as the Fetus Nebula, is a planetary nebula with a diameter of approximately 1 light-year [2] located at a distance of 2800 light years [2] in northern Cygnus. It was discovered by William Herschel in 1787, in Slough , England.