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To change this template's initial visibility, the |state= parameter may be used: {{ Milky Way | state = collapsed }} will show the template collapsed, i.e. hidden apart from its title bar. {{ Milky Way | state = expanded }} will show the template expanded, i.e. fully visible.
The Milky Way's spiral structure is uncertain, and there is currently no consensus on the nature of the Milky Way's arms. [212] Perfect logarithmic spiral patterns only crudely describe features near the Sun, [ 210 ] [ 213 ] because galaxies commonly have arms that branch, merge, twist unexpectedly, and feature a degree of irregularity.
The Greek name for the Milky Way (Γαλαξίας Galaxias) is derived from the Greek word for milk (γάλα, gala). One legend explains how the Milky Way was created by Heracles (Roman Hercules) when he was a baby. [16] His father, Zeus, was fond of his son, who was born of the mortal woman Alcmene.
The term "The Local Group" was introduced by Edwin Hubble in Chapter VI of his 1936 book The Realm of the Nebulae. [11] There, he described it as "a typical small group of nebulae which is isolated in the general field" and delineated, by decreasing luminosity, its members to be M31, Milky Way, M33, Large Magellanic Cloud, Small Magellanic Cloud, M32, NGC 205, NGC 6822, NGC 185, IC 1613 and ...
In general, various scenarios for the formation of this structure have been proposed, including: Thick disks come from the heating of the thin disk [9] [10] It is a result of a merger event between the Milky Way and a massive dwarf galaxy [3] More energetic stars migrate outwards from the inner galaxy to form a thick disk at larger radii [11] [12]
Figure 1.The observed structure of the Milky Way's spiral arms [1]. The Orion Arm, also known as the Orion–Cygnus Arm, is a minor spiral arm within the Milky Way Galaxy spanning 3,500 light-years (1,100 parsecs) in width and extending roughly 20,000 light-years (6,100 parsecs) in length. [2]
The Milky Way's central black hole, known as Sagittarius A*, has a mass four million times greater than the Sun. As of March 2016, GN-z11 is the oldest and most distant observed galaxy with a comoving distance of 32 billion light-years from Earth, and observed as it existed just 400 million years after the Big Bang.
Based upon the emerging science of nucleocosmochronology, the Galactic thin disk of the Milky Way is estimated to have been formed 8.8 ± 1.7 billion years ago. [6] It may have collided with a smaller satellite galaxy, causing the stars in the thin disk to be shaken up and creating the thick disk, [ 7 ] while the gas would have settled into the ...
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