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Spiral Galaxies. Spiral galaxies are the most common type in the universe. Our Milky Way is a spiral, as is the rather close-by Andromeda Galaxy.Spirals are large rotating disks of stars and nebulae, surrounded by a shell of dark matter. Irregular Galaxy Most galaxies can be categorized by their shape. Our own Milky Way is a spiral galaxy, for example, and the largest galaxies in the Universe are elliptical galaxies. In galaxy: Irregular galaxies. Most representatives of this class consist of grainy, highly irregular assemblages of luminous areas. They have neither noticeable symmetry nor an obvious central nucleus, and they are generally bluer in colour than are the arms and disks of spiral galaxies.

'A Spectral Classification of Galaxies.' Publications of the Astronomical Society of the Pacific. 69 (409): 291–303. • • Walter, F. Astophys J 661, 102 - 114, 2007 • Elmegreen, Debra Meloy, and Bruce G.

A mosaic image taken by the of Messier 82, combining exposures taken with four colored filters that capture starlight from visible and infrared wavelengths as well as the light from the glowing hydrogen filaments. Observation data ( ) 09 h 55 m 52.2 s +69° 40′ 47″ 000000000♠203 ±4 km/s 11.4-12.4 (3.5-3.8 ) (V) 8.41 Characteristics I0 Size ~37,000ly in diameter (V) 11′.2 × 4′.3 Notable features Edge on starburst galaxy Other designations 3034, 5322, 337, Cigar Galaxy, 28655, 231 See also:, Messier 82 (also known as NGC 3034, Cigar Galaxy or M82) is a approximately 12 million away in the. A member of the, it is about five times than the whole and has a center one hundred times more luminous than our galaxy's center. The starburst activity is thought to have been triggered by interaction with neighboring galaxy.

Irregular I Galaxies (Irr I): The first sub-type of irregular galaxies are known as Irr-I galaxies (Irr I for short) and are characterized by having some structure, but not enough to classify it as a spiral or elliptical galaxies (or any other type). Some catalogs break this sub-type down even further into those that exhibit either spiral features (Sm) - or barred spiral features (SBm) - and those that have structure, but not structure associated with spiral galaxies such as a central bulge or arm features. These are therefore identified as 'Im' irregular galaxies. Dwarf Irregular Galaxies: The final type of irregular galaxy is the dwarf irregular galaxy mentioned above.

• A galaxy that does not have the clearly defined shape and structure of typical elliptical, lenticular, or spiral galaxies. Irregular galaxies typically contain large amounts of gas and dust, and their stars are often young. They account for only a small percentage of known galaxies. Some irregular galaxies are the result of gravitational interactions or collisions between formerly regular galaxies. Many irregular galaxies orbit larger regular ones; the Magellanic Cloud galaxies orbiting the Milky Way are examples.

The earth is the universe, organ systems inside the human body are solar or planetary systems, and their respective organs are the stars and planets. Galaxies differ in shape, size and other characteristics in the same way that human bodies do. Hence we have galaxy classifications; one of them is symmetry and an example is an irregular galaxy. An irregular galaxy has no rotational symmetry, the cause of which may be mere immaturity (think of a boy still experiencing pubertal changes with his body); collisions with other galaxies, or even just the mere interaction of its gravitational force with another galaxy.

With just one billion stars, it appears to be a small galaxy in the process of being consumed by our own galaxy.

Faulkes Telescope Educational Guide - Galaxies - Irregulars Irregular Galaxies Introduction As the name suggests, 'irregular' galaxies have no specific form, and so the group contains a very diverse selection of objects. In fact, there are two types of irregular galaxy. Type I's are usually single galaxies of peculiar appearance. They contain a large fraction of young stars, and show the luminous that are also visible in spiral galaxies. Type II irregulars include the group known as interacting or disrupting galaxies, in which the strange appearance is due to two or more galaxies colliding, merging or otherwise interacting gravitationally. Type II's appear to contain a large amount of dust.

Their luminosities range from 10 7 to 10 9 solar, making them generally fainter than. The best known examples of irregular galaxies are the Small and clouds. These are companion galaxies to our own, and can be easily seen at dark sites in the Southern Hemisphere.

SMALL MAGELLANIC CLOUD The Small Magellanic Cloud (SMC) is an irregular-shaped in the. The irregular shape may be the result of a disturbance, perhaps a collision of two galaxies. The Small Magellanic Cloud (SMC) is near the Tucana, and is under 200,000 away.

Photographed it in, which shows dust emission, and photographed it in (showing mostly synchrotron emissions from fast ). The X-ray emission is shown in the blue parts. M82 was previously believed to be an. In 2005, however, two symmetric were discovered in (NIR) images of M82.

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An example of an irregular galaxy. It is an Irr-I category galaxy about 52 Mly distant. An irregular galaxy is a that does not have a distinct regular shape, unlike a or an. Irregular galaxies do not fall into any of the regular classes of the, and they are often chaotic in appearance, with neither a nor any trace of structure. Collectively they are thought to make up about a quarter of all galaxies. Some irregular galaxies were once spiral or elliptical galaxies but were deformed by an uneven external gravitational force. Irregular galaxies may contain abundant amounts of gas and dust.

This is not necessarily true for dwarf irregulars. Irregular galaxies are commonly small, about one tenth the mass of the Milky Way galaxy. Due to their small sizes, they are prone to environmental effects like crashing with large galaxies and intergalactic clouds. Contents • • • • • • Types [ ] There are three major types of irregular galaxies: • An Irr-I galaxy ( Irr I) is an irregular galaxy that features some but not enough to place it cleanly into the Hubble sequence. • Subtypes with some spiral structure are called galaxies • Subtypes without spiral structure are called Im galaxies.

It may also be due to the ejection of energetic bubbles of gas which contribute to the galaxy having a blobby appearance. An example of an irregular galaxy is the Large Magellanic Cloud (LMC), a galaxy 163,000 light-years away in the Local Group near the constellation Dorado. Its irregular shape is speculated to have been due to disturbance such as the collision of two galaxies. Quick glance at Irregular Galaxies.

APOD: 2018 September 21 - Irregular Galaxy NGC 55 Astronomy Picture of the Day Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2018 September 21 Irregular Galaxy NGC 55 Image Credit &: Explanation: Irregular galaxy NGC 55 is thought to be similar to the Large Magellanic Cloud (LMC). But while is about 180,000 light-years away and is a well known satellite of our own Milky Way Galaxy, NGC 55 is more like 6 million light-years and is a member of the.

As the name suggests, these galaxies are smaller versions of the two sub-types listed above. Some of them contain structure (dIrrs I), while others have no trace of such features (dIrrs II). There is no official cut-off, size-wise, for what constitutes a 'normal' irregular galaxy and what is a dwarf. However, the tend to have low metallicity (that means that they are mostly hydrogen, with low amounts of heavier elements). They may also form in a different way than normal-sized irregular galaxies. However, some galaxies currently classified as dwarf Irregulars are simply small spiral galaxies that have been distorted by a much larger nearby galaxy.