Andromeda galaxy is the nearest galaxy to our galaxy Milky Way. It is a spiral galaxy. It is known also Messier31, M31 and NGC224. Its old name was Great Andromeda Nebula.
German astronomer Simon Marius give first description about Andromeda Galaxy in 15 December 1612 which based on telescopic observation.
In 2010, astronomers confirms that M31 formed due to collide two Smaller Galaxy approximately between 5 to 9 billion years ago.
- It is the largest galaxy in our local group ( local group contains our Milky way, Triangulum Galaxy and 44 other smaller galaxies).
- It is the nearest largest galaxy to our milky way.
- it is 2,20,000 light years across.
- It contains approximately 1 trillion stars.
- It is 2.5 million light years away from the earth.
- Andromeda galaxy and Milky way galaxy are expected to collide in Giant Elliptical Galaxy after 3.7 billion years.
- It is the brightest galaxy in Local Group.
- Andromeda Galaxy is not most massive than Milky Way because Milky Way contains dark matter in massive quantity.
- Andromeda Galaxy approaching Milky Way at approximately 100-140 km/sec.
- Scientists estimated that it contains at least one SMBH (Super Massive Black Hole) at its core.
It is most distant thing which is visible to naked eye. it appears more than six times wide larger than full moon.you can see it by naked eye from mid-northern latitude. You can see it perfect in last September and early October . It shines in your earthen sky in night. For good viewing, you can observe it in winter evening.