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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 ]
The plot reveals whether hydrophobic amino acids are concentrated on one side of the helix, usually with polar or hydrophilic amino acids on the other. This arrangement is common in alpha helices within globular proteins, where one face of the helix is oriented toward the hydrophobic core and one face is oriented toward the solvent-exposed surface.
Its presentation as a catalogue with distinct designations, rather than a list, potentially may cause confusion amongst amateur astronomers as the 'C' Designation is not commonly used. The list was promoted as an extension of the Messier Catalogue, however the objects are often arbitrary with many easily viewable objects omitted while some ...
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NGC 604, one of largest nebulae (H II region) is located in the Triangulum Galaxy (viewed by the Hubble Space Telescope).. Below is a list of the largest known nebulae so far discovered, ordered by actual diameter.
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.
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 ]
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.