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The Andromeda Galaxy is visible to the naked eye in dark skies. [21] Around the year 964 CE, the Persian astronomer Abd al-Rahman al-Sufi described the Andromeda Galaxy in his Book of Fixed Stars as a "nebulous smear" or "small cloud". [22] Star charts of that period labeled it as the Little Cloud. [23]
a variable star in the constellation of Andromeda. It is classified as a semiregular variable pulsating giant star, and varies from an apparent visual magnitude of 14.5 at minimum brightness to a magnitude of 9.9 at maximum brightness, with a period of approximately 238.3 days.
The most famous deep-sky object in Andromeda is the spiral galaxy cataloged as Messier 31 (M31) or NGC 224 but known colloquially as the Andromeda Galaxy for the constellation. [53] M31 is one of the most distant objects visible to the naked eye, 2.2 million light-years from Earth (estimates range up to 2.5 million light-years). [ 54 ]
The most powerful telescope to be launched into space has made history by detecting a record number of new stars in a distant galaxy. NASA's James Webb Space Telescope, history's largest and most ...
NGC 206 is the richest and most conspicuous star cloud in the Andromeda Galaxy, and is one of the largest and brightest star-forming regions in the Local Group. [2] It contains more than 300 stars brighter than M b =−3.6. [3] It was originally identified by Edwin Hubble as a star cluster but today, due to its size, it is classified as an OB ...
Host galaxy Star system Stars in system Spectral type Apparent magnitude (V) Comments and references Andromeda LGGS J004051.59+403303.0: 1: LBV: 16.989 [6] Andromeda AE Andromedae (HV 4476) 1 LBV 17.0–17.9 [6] Andromeda AF Andromedae (HV 4013) 1 LBV 17.325 [6] Andromeda Var 15 ([WB92a] 370) 1 LBV 18.450 [6] Andromeda Var A-1 1 LBV 17.143 [6 ...
Although stars are more common near the centers of each galaxy, the average distance between stars is still 160 billion (1.6 × 10 11) km (100 billion mi). That is analogous to one ping-pong ball every 3.2 km (2 mi). Thus, it is extremely unlikely that any two stars from the merging galaxies would collide. [6]
Below are lists of the largest stars currently known, ordered by radius and separated into categories by galaxy. The unit of measurement used is the radius of the Sun (approximately 695,700 km ; 432,300 mi ).