Irregular galaxy
Videos
An Irregular galaxy is a galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy. Irregular galaxies do not fall into any of the regular classes of the Hubble seque
NGC 1427A, an example of an irregular galaxy. It is an Irr-I category galaxy about 52 Mly distant.
Blue compact dwarf galaxy ESO 338-4
IC 4710 lies roughly 25 million light-years away in the southern constellation of Pavo.
Irregular galaxy IC 3583 has been found to have a bar of stars running through its center.
Spiral galaxy
Videos
Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, form part of the Hubble sequence. Most spiral galaxies consist of a
Irregular galaxy
…An Irregular galaxy is a galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy. Irregular galaxies do not fall into any of the regular classes of the Hubble sequence, and they are often chaotic in appearance…
An example of a spiral galaxy, Messier 77 (also known as NGC 1068)
Tuning-fork-style diagram of the Hubble sequence
Barred spiral galaxy UGC 12158
NGC 1300 in infrared light