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First I would like to start off by telling you what an irregular galaxy is An irregular galaxy is a galaxy that possesses no particular shape and does not have any sort of structure to it Iirregualr galaxies are fairly easy to distinguish from one another first you check whether the galaxy is elliptical or spiral if not it is safe to say that it is an irregular galaxy These galaxies have many bright stars and regions of hot luminous gas as well Though these galaxies don fit into elliptical or spiral classes some do have what appears to be patches of structure that suggest fragments of a spiral arm Due to this as discover by Edwin Hubble some irregular galaxies appear to be an extension of the spiral galaxy classification After looking closer at these irregular galaxies Hubble decided to reclassify them into other subclasses A good example of this would be an irregular galaxy of Hubble type Irr I called NGC 1156 this galaxy is inconspicuous and somewhat messy-looking compared with spiral galaxies is now termed as an SO galaxy Another reason these galaxies are similar is that they possess a bulge though the bulge is much smaller and the disk shows no structure Generally these types of galaxies have a low mass and are very rich in gas which makes up ten to twenty percent of their mass Another class of irregular galaxies which was discovered during the 1950s by a Swiss-American astronomer named Fritz Zwicky are blue compact galaxies These galaxies have much smaller dimensoins than irregular galaxies and unlike the Magellinc type has masses of the order of several hundred million solar masses Blue compact galaxies have not always had a high rate of star formation but being that they have a large quantity of ionised gas there is a lot of activity taking place within the galaxy But these two different galaxies do share one
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