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The unit of measurement used is the light-year (distance traveled by light in one Julian year; approximately 9.46 trillion kilometres). This list includes superclusters, galaxy filaments and large quasar groups (LQGs). The structures are listed based on their longest dimension.
IC 1101 is considered a large galaxy characterized by an extensive, diffuse halo. This is the intracluster light, or ICL, free-flying stars that are not bound to any galaxy. This ubiquitous mass of stars within galaxy clusters are usually more concentrated around the brightest cluster galaxies, such as IC 1101, however. [31]
The New General Catalogue of Nebulae and Clusters of Stars (abbreviated NGC) is an astronomical catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888. The NGC contains 7,840 objects, including galaxies, star clusters and emission nebulae.
Encyclopedia Galactica is the name of a number of fictional or hypothetical encyclopedias containing all the knowledge accumulated by a galaxy-spanning civilization, most notably in Isaac Asimov's Foundation series. The concept of a "future encyclopedia" has become "something iconic among many lovers of the science fiction", and has been reused ...
The obscured dwarf galaxy PGC 39058 Hubble image of the elliptical galaxy PGC 6240. [1]The Principal Galaxies Catalogue (PGC) is an astronomical catalog published in 1989 that lists B1950 and J2000 equatorial coordinates and cross-identifications for 73,197 galaxies.
Both were once considered to be part of the Local Group, [6] but are now known to be among the dozen bright spiral galaxies near the Milky Way but beyond the confines of the Local Group. [7] NGC 6946 lies within the Virgo Supercluster. [8] The galaxy was discovered by William Herschel on 9 September 1798.
Messier 74 (also known as NGC 628 and Phantom Galaxy) is a large spiral galaxy in the equatorial constellation Pisces. [ a ] It is about 32 million light-years away from Earth. [ 6 ] The galaxy contains two clearly defined spiral arms and is therefore used as an archetypal example of a grand design spiral galaxy . [ 7 ]
Local Group of 47 galaxies [13] coalesces into a single large galaxy [14] Visualization of the orbit of the Sun (yellow dot and white curve) around the Galactic Center (GC) in the last galactic year. The red dots correspond to the positions of the stars studied by the European Southern Observatory in a monitoring program.