Andromeda Galaxy (Messier 31, M31, or NGC 224)


With the appearance of advanced telescopes and science, the Andromeda Galaxy is instantly notorious for being some 2.5 million light-years of us. An estimate of that for just a consequence – the light that you observe from this giant galaxy split the stars of Andromeda 2.5 million years ago and got here in October of 2020.

Thought to accommodate well over 1 trillion stars, this galaxy is longer than our Milky Way. Let’s now resemble how to determine this astronomical treat in our pre-Halloween heavens! positioned high in the northeastern sky encompassing 9 p.m. Arizona time, the Andromeda Galaxy hangs right into the antique zodiac of Andromeda, the offspring of Cassiopeia and Cepheus.

The Andromeda galaxy (also recognized as Messier 31, M31, or NGC 224), a spiral, is the largest affiliate of the Local Group of galaxies and onward with the Milky Way, both command the Local Group. It is the nearest giant spiral to the Milky Way.

It has an apparent dimension of V = 3.6 (executing it a naked-eye object), an arbitrary magnitude of MV = -20.6, and having a preference at 12.5 degrees to our line-of-sight. The galaxy has a total volume of 5 × 1011 solar masses and a HI mass of 4 × 109 solar masses.

Key Facts & Summary


  • While Andromeda is the greater galaxy in the Local array may not be the several massive. The Milky May is concluding in more dark matter, which could perform it much further massive.
  1. Considering it is the nearest spiral galaxy to us, astronomers use the Andromeda Galaxy to conjecture the genesis and metamorphosis of such galaxies.
  2. A microlensing appearance PA-99-N2 was expose 1999, which allowed discovering the primary exoplanet 6.34 times the volume of Jupiter outside of the Milky Way.
  3. An organization of astronomers in 2010 believe that M31 was constituted 5 and 9 billion years ago when two smaller galaxies conflicted and merged.


History of the Andromeda Galaxy

The Andromeda Galaxy has tantalized astronomers since ancient periods. Unusual of the oldest records date following to the 10th century. Up till the early 1900s, endure believed that Andromeda was a galaxy within the Milky Way galaxy.

It was common that all of the macrocosms contained within our elliptical galaxy, however, considerations about the presence of extragalactic intentions as shortly as the 17th century, most prominently by a French mathematician Pierre Louis Maupertuis.

He envisioned that beautiful and moderately accurate concept of “island universes” with their quasars, planets, and other astronomical bodies. He has later excerpted well-known now German philosopher Immanuel Kant in his commitment Universal Natural History and Theory of the Heavens.


How to find it in the night sky?

Then entirety fall night, while seeking down globulars and another minute fascinates in the galaxy, I substituted the scope to NGC 206, M31'biggest lightest star nebula.
The object, which relates a weakly concentrated 10th-magnitude comet superimposed on Andromeda's southwestern stream, measures 4.2′ across.

Its true dimension is about 4,000 light-years beyond or nearly three times the range from Earth to the star Deneb in the Northern Cross, performing it one of the largest star nebulae in the Limited Group of galaxies.




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