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An Irr-II galaxy ( Irr II) is an irregular galaxy that does not appear to feature any structure that can place it into the Hubble sequence. A dI-galaxy (or dIrr) is a dwarf irregular galaxy. [7] This type of galaxy is now thought to be important to understand the overall evolution of galaxies, as they tend to have a low level of metallicity and ...
Irregular galaxies. This category contains galaxies in the Irr-I, Irr-II, dI, Sm and Im categories. Dwarf galaxies may be categorized under Category:Dwarf irregular galaxies. Wikimedia Commons has media related to Irregular galaxies.
Named after its discoverer, Eric Lindsay, his professor Harlow Shapley, and its nature as a ring galaxy . The ring is the result of collision with another galaxy. Little Sombrero Galaxy. Pegasus. Named after its similarity to the Sombrero Galaxy . Malin 1. Coma Berenices. Discovered and named by David Malin .
Galaxies are categorised according to their visual morphology as elliptical, spiral, or irregular. The Milky Way is an example of a spiral galaxy. It is estimated that there are between 200 billion (2 × 10 11) to 2 trillion galaxies in the observable universe.
The Magellanic Clouds ( Magellanic system [2] [3] or Nubeculae Magellani [4]) are two irregular dwarf galaxies in the southern celestial hemisphere. Orbiting the Milky Way galaxy, these satellite galaxies are members of the Local Group. Because both show signs of a bar structure, they are often reclassified as Magellanic spiral galaxies.
Dwarf galaxy. A dwarf galaxy is a small galaxy composed of about 1000 up to several billion stars, as compared to the Milky Way 's 200–400 billion stars. [1] The Large Magellanic Cloud, which closely orbits the Milky Way and contains over 30 billion stars, [2] is sometimes classified as a dwarf galaxy; others consider it a full-fledged galaxy.
Peculiar galaxy. ESO 162-17 is an example of a peculiar galaxy which is 40 million light-years away in the constellation Carina. A peculiar galaxy is a galaxy of unusual size, shape, or composition. [1] Between five and ten percent of known galaxies are categorized as peculiar. [2] Astronomers have identified two types of peculiar galaxies ...
Galaxy morphological classification is a system used by astronomers to divide galaxies into groups based on their visual appearance. There are several schemes in use by which galaxies can be classified according to their morphologies, the most famous being the Hubble sequence , devised by Edwin Hubble and later expanded by Gérard de ...