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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).
This is a list of largest galaxies known, sorted by order of increasing major axis diameters. The unit of measurement used is the light-year (approximately 9.46 × 10 12 kilometers). Overview
In this map of the Observable Universe, objects appear enlarged to show their shape. From left to right celestial bodies are arranged according to their proximity to the Earth. This horizontal (distance to Earth) scale is logarithmic.
A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek galaxias, literally 'milky', a reference to the Milky Way galaxy that contains the Solar System.
The Milky Way is an example of a spiral galaxy. It is estimated that there are between 200 billion [7] (2 × 10 11) to 2 trillion [8] galaxies in the observable universe. Most galaxies are 1,000 to 100,000 parsecs in diameter (approximately 3,000 to 300,000 light years) and
Void name/designation Maximum dimension (in light-years) Notes LOWZ North 13788 void: 2,953,000,000: One of largest known voids, containing 109,066 known galaxies. [29] Local Hole: 2,000,000,000: Proposed void containing the Milky Way galaxy and Local Group as an explanation for the discrepancy in the Hubble constant. Existence is still ...
Most distant (difficult) naked eye object. Closest unbarred spiral galaxy to us and third largest galaxy in the Local Group. 61,100 ly 96 Andromeda XXI [68] dSph [55] 2.802 0.859 −9.9 Local Group: Satellite of Andromeda 97 Tucana Dwarf: dE5 2.87 0.88 [7] −9.16 15.7 [1] Local Group [7] Isolated group member — a 'primordial' galaxy [69] 98 ...
A spiral galaxy is a type of galaxy characterized by a central bulge of old Population II stars surrounded by a rotating disc of younger Population I stars. A spiral galaxy maintains its spiral arms due to density wave theory.