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A spiral galaxy is a type of galaxy characterized by a central bulge of old Population II stars ... 10.1 M101, Pinwheel Galaxy: SAB(rs)cd Ursa Major: 8.3 M104 ...
Size (left) and distance (right) of a few well-known galaxies put to scale. There are an estimated 100 billion galaxies in all of the observable universe. [1] On the order of 100,000 galaxies make up the Local Supercluster, and about 51 galaxies are in the Local Group (see list of nearest galaxies for a complete list).
Milky Way Galaxy's spiral arms and barred core – based on WISE data. The Milky Way was once considered an ordinary spiral galaxy. Astronomers first began to suspect that the Milky Way is a barred spiral galaxy in the 1960s.
It is the largest known spiral galaxy with the isophotal diameter of over 717,000 light-years (220 kiloparsecs). [ 1 ] This is a list of largest galaxies known, sorted by order of increasing major axis diameters.
Spiral galaxy: Pisces: 00 h 41 m 10.1 s +16° 28′ 08″ 14.8 214: Spiral galaxy: Andromeda: 00 h 41 m 27.9 s +25° 30′ 01″ 13.0 215: Lenticular galaxy: Phoenix ...
10.36 [1] Local Group: Satellite of Andromeda 86 Andromeda Galaxy (M31) SA(s)b 2.538 [52] 0.778 −21.58 [7] 4.17 [1] Local Group: Largest Galaxy in the Local Group (The Milky Way is the second largest), with at least 19 satellite galaxies. Barred spiral galaxy. 152,000 ly 87 Pegasus Dwarf Spheroidal (Andromeda VI) dSph [53] 2.55 [52] 0.78 − ...
An example of a spiral galaxy (Pinwheel Galaxy). This category contains galaxies in the S (de Vaucouleurs for indeterminate) category or any galaxy where it is indeterminate whether the galaxy is SA, SB or SAB in its spiral nature. SA, S (Hubble) galaxies should be categorized under Category:Unbarred spiral galaxies
The age of these clusters was estimated to be less than 2 million years while their mass was estimated to be 10 4 –10 5 M ☉. Their location was also correlated with H-alpha and CO(2–1) emission. [2] Clumpy ultraviolet emission has been observed from the spiral arms of the galaxy.