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A galaxy is a system of stars, ... is a spiral galaxy having the number 109 in the ... A significant portion of the galaxy's total energy output is emitted by ...
[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 ...
Number of stars: 100–400 billion ... is the galaxy that includes the Solar System, with the name describing the galaxy's appearance from Earth: ... of the total ...
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 ...
This is a list of star systems within 75–80 light years of Earth. The closest B-type star, Regulus , is in this list. This list is incomplete ; you can help by adding missing items .
Study of the number of proplyds (protoplanetary disks, clumps of gas in nebulae from which stars and planetary systems are formed) indicates that the number of stars in the galaxy should be several orders of magnitude higher than what was previously conjectured. It is theorized that these proplyds are in a race with each other.
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Number of stars ~1 trillion ... The total mass of the galaxy increases linearly out to 45,000 ly ... from systems as old as the galaxy itself to much younger systems ...