All galaxies appear to be unique; they are all equally uncommon.
Except ours; the Milky Way is the only galaxy to have US in it.
Edit : Galaxies are classified into various types. The most uncommon type
is known as "Irregular".
There is a lot of doubt about the answer to this question. Depending on the sources, it could be spiral or elliptical.
The most common type of galaxy is a dwarf galaxy.
Of the main types of galaxies:
Within our "local area" spiral galaxies are the most common with anywhere between 60 -> 75% of all galaxies. Ellipticals account only for 3 -> 20% whereas Irregular account for 5 -> 25%.
Confused? You should be.
The problem with the data is that it doesn't stipulate the area involved. Most percentages and answers are related to our local area and not the whole Universe. Also, as the most common type of galaxy is a dwarf elliptical galaxy, they use this as an Elliptical galaxy.
Also, as observation data on far away galaxies is a record of what they were then, not what they are now.
So: A dwarf elliptical galaxy is the most common type of galaxy, and a Spiral galaxy is the most common type of main galaxy.
Locally Main- Spiral galaxies are more common making up about 60% of all galaxies, whereas elliptical galaxies only account for about 10 - 15%
The ellipticalgalexy is most common in the universe, being about 70% of all galaxies we are aware of.
A difficult question as we don't know everything about the Universe.
A ball park figure would put dwarf galaxies as the most abundant.
Class M types.
Elliptical Galaxy
elliptical
dwarf galaxy
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The most common type is main-sequence stars. This is a fairly broad category; within it, the most common type is red dwarves.
The most abundant type of stars is red dwarves.
Dark energy is believed to make up about 73% of the mass of the Universe; dar matter about 23%; and normal matter - the kind we know most about - about 4%. In the case of normal matter, most of it is still in the form of hydrogen.
The Baby Boom Galaxy is a starburst galaxy
The Andromeda Galaxy is a spiral barred galaxy, similar to our own galaxy, the Milky Way.
Elliptical
Quasars are the unusual type of active galaxy in the universe.
Plasma is the most common type of matter in the universe
Irregular galaxy
The most common type is main-sequence stars. This is a fairly broad category; within it, the most common type is red dwarves.
It is a common noun.
The most common type of galaxy is a dwarf elliptical galaxy.If you classify a dwarf galaxy as a galaxy, then that is your answer, however, if you don't, then a spiral galaxy will be the answer.See the related question for more details.
The most common type of energy/mass in the Universe is in the form of dark energy, followed by dark matter. Only about 4% of the Universe is in the form of "normal" (baryonic) matter. If it is specifically to this matter you refer: the most common state of matter is plasma, found in stars.
There are many red dwarf stars in the universe. They are not most common type of star.
Typically irregular galaxies have the oldest stars
The largest Galaxy ever discovered was IC1101, an Elliptical Galaxy, but the most common large ones are Spirals such as the biggest Galaxies in the Local Group, Andromeda, Milky Way, and Triangulum; all Spirals.
The most common stars are Red Dwarfs. It is probable that up to 80% of all stars in the universe are red dwarfs. They are not visible on the on the H-R Diagram because they are hard to observe from Earth due to their low-luminosity. In contrast O-type and B-type supergiants are extremely rare. The reason for this is because they evolve and die quickly.