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M82 was previously believed to be an irregular galaxy.
In contrast, elliptical and irregular galaxies, he said, are barren.
Irregular galaxies may contain abundant amounts of gas and dust.
I Zwicky 18 is a dwarf irregular galaxy located about 59 million light years away.
In both cases, many of the constituent galaxies are irregular galaxies.
They are commonly divided into spiral, elliptical and Irregular galaxies.
In fact, current evidence suggests the opposite: the early Universe appears to be dominated by spiral and irregular galaxies.
Both of the galaxies involved in the collision are barred irregular galaxies.
Dwingeloo 2 is a small irregular galaxy discovered in 1996 and located about 10 million light-years away from the Earth.
There are two major Hubble types of irregular galaxies:
Irregular galaxies do not fall into any of the regular types of the Hubble sequence.
These classes are extended for finer distinctions of appearance and to encompass irregular galaxies.
The host galaxies of Seyferts are usually spiral or irregular galaxies.
IC 10 is an irregular galaxy in the constellation Cassiopeia.
Smaller galaxies lacking a coherent structure are referred to as irregular galaxies.
A lenticular galaxy is a type of irregular galaxy.
Open clusters have been found only in spiral and irregular galaxies, in which active star formation is occurring.
Another prominent member of the group is the irregular galaxy NGC 55.
In the 1980s, with Deidre Hunter, he made the first substantial studies of dwarf irregular galaxies.
Irregular galaxies are chaotic in appearance, and are neither spiral nor elliptical.
Nearby examples of (dwarf) irregular galaxies include the Magellanic Clouds.
Irregular galaxies often exhibit spaced knots of starburst activity.
It is believed that giant elliptical galaxy form when spirals and irregular galaxies collide.
These are categorized as irregular galaxies.
Together with irregular galaxies, spiral galaxies make up approximately 60% of galaxies in the local Universe.
Wörterbuch für Astronomie