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Milky Way Galaxy's spiral arms and barred core – based on WISE data. The Milky Way was once considered an ordinary spiral galaxy. Astronomers first began to suspect that the Milky Way is a barred spiral galaxy in the 1960s.
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.
2005 – Spitzer Space Telescope data confirm what had been considered likely since the early 1990s from radio telescope data, i.e., that the Milky Way Galaxy is a barred spiral galaxy. [14] [15] 2012 – Astronomers report the discovery of the most distant dwarf galaxy yet found, approximately 10 billion light-years away. [16]
Artist's image of a firestorm of star birth deep inside the core of a young, growing elliptical galaxy NGC 4676 (Mice Galaxies) is an example of a present merger. The Antennae Galaxies are a pair of colliding galaxies – the bright, blue knots are young stars that have recently ignited as a result of the merger.
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).
It is the largest known spiral galaxy with the isophotal diameter of over 717,000 light-years (220 kiloparsecs). [ 1 ] This is a list of largest galaxies known, sorted by order of increasing major axis diameters.
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 [66] dSph [53] 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 [67] 98 ...
UGC 3478 is a spiral galaxy, located in the constellation of Camelopardalis. [3] [4] Is is located at 128 million light-years from Earth. [5] It features a growing supermassive black hole (AGN) at its center. [6]