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The Persian astronomer Nasir al-Din al-Tusi (1201–1274) in his Tadhkira wrote: "The Milky Way, i.e. the Galaxy, is made up of a very large number of small, tightly clustered stars, which, on account of their concentration and smallness, seem to be cloudy patches. Because of this, it was likened to milk in color."
Second largest galaxy in the group, which may or may not be the most massive galaxy of the group. [13] Diameter (D 25 isophote): 87,400 light-years Mass: (1.54 ± 0.1) × 10 12 M ☉ Number of stars: (2.5 ± 1.5) × 10 11. Triangulum Galaxy (M33, NGC 598) SAcd Triangulum: Third largest, only unbarred spiral galaxy and possible satellite of the ...
[citation needed] The surveys are most often made of nearby stars in the Milky Way galaxy. [citation needed] The total number of stars counted in a particular direction depends on the location and density of stars, the luminosity function, and the absorption. [2] Star count programs can therefore collect data that bounds or determines these ...
M82, a starburst galaxy that has ten times the star formation of a "normal" galaxy [111] Stars are created within galaxies from a reserve of cold gas that forms giant molecular clouds. Some galaxies have been observed to form stars at an exceptional rate, which is known as a starburst. If they continue to do so, they would consume their reserve ...
Each spot is a galaxy, consisting of billions of stars. The light from the smallest, most redshifted galaxies originated nearly 13.8 billion years ago. The comoving distance from Earth to the edge of the observable universe is about 14.26 giga parsecs (46.5 billion light-years or 4.40 × 10 26 m) in any direction.
Number of stars ~1 trillion ... The total mass of the galaxy increases linearly out to 45,000 ly (2.8 billion AU), then more slowly beyond that radius. [87]
Of several items, then called radio stars, Cygnus A was identified with a distant galaxy, being the first of many radio stars to become a radio galaxy. [25] [26] First quasar: 3C273: Virgo: 1962 3C273 was the first quasar with its redshift determined, and by some considered the first quasar. [citation needed] 3C48: Triangulum: 1960
The word galaxy is derived from the Greek galaxias (γαλαξίας), literally "milky", a reference to the Milky Way. Galaxies range in size from dwarfs with just a few billion (109) stars to giants with one hundred trillion (1014) stars, each orbiting its galaxy's center of mass.