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galactic tide The tidal force experienced by objects subject to the gravitational field of a galaxy such as the Milky Way. galactocentric distance A star or cluster's distance from the gravitational center of a particular galaxy. For example, the Sun is about 27,000 light-years (approximately 8 kiloparsecs) away from the Galactic Center of the ...
The thin disk contributes about 85% of the stars in the Galactic plane [3] and 95% of the total disk stars. [2] It can be set apart from the thick disk of a galaxy since the latter is composed of older population stars created at an earlier stage of the galaxy formation and thus has fewer heavy elements. Stars in the thin disk, on the other ...
Superclusters, galactic filaments and voids Notable astronomical objects and their known physical features. This is a list of lists, grouped by type of astronomical object .
The adjectival forms of the names of astronomical bodies are not always easily predictable. Attested adjectival forms of the larger bodies are listed below, along with the two small Martian moons; in some cases they are accompanied by their demonymic equivalents, which denote hypothetical inhabitants of these bodies.
The north galactic pole is situated at right ascension 12 h 49 m, declination +27.4° near β Comae Berenices, and the south galactic pole is near α Sculptoris. Because of this high inclination, depending on the time of night and year, the Milky Way arch may appear relatively low or relatively high in the sky.
Soon after, it was proposed as a distinct galactic structure in the Milky Way, different from the thin disk and the halo in the 1983 article by Gilmore & Reid. [2] It is supposed to dominate the stellar number density between 1 and 5 kiloparsecs (3.3 and 16.3 kly ) above the galactic plane [ 2 ] and, in the solar neighborhood , is composed ...
The galactic plane is the plane on which the majority of a disk-shaped galaxy's mass lies. The directions perpendicular to the galactic plane point to the galactic poles . In actual usage, the terms galactic plane and galactic poles usually refer specifically to the plane and poles of the Milky Way , in which Planet Earth is located.
A group of galaxies is the most common type of galactic cluster; these formations contain the majority of galaxies (as well as most of the baryonic mass) in the universe. [ 165 ] [ 166 ] To remain gravitationally bound to such a group, each member galaxy must have a sufficiently low velocity to prevent it from escaping (see Virial theorem ).