In comparison, stars of the disk of the Milky Way, e.g., our Sun, are subject only to a simple rotation. In the huge Andromeda disk, all stars older than 2 billion years undergo random motions, the scale of which being almost comparable to their rotation around the centre of this galaxy.
It is our closest neighbour and this allows the observers to scrutinize its properties, which intrigued the astrophysicists until today.Īn observational campaign made between 2006 in 2014 by American astronomers, has underlined a considerable difference with the Milky Way. Listed in 1923 as a galaxy, Andromeda has been often considered as the twin sister of our Milky Way. In 964, the Persian astronomer, Abd al-Rahman al-Sufi described for the first time the large nebula of Andromeda.
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