Andromeda Galaxy | Spherical Galaxy | Black Holes
Andromeda galaxy is the largest galaxy in the universe. Andromeda galaxy is the closest galaxy to our Milky Way galaxy. Andromeda galaxy is also known as M31 or NGC 224. Andromda is a spherical galaxy. There are 26 black holes present in the Andromeda and also a super massive black hole at its centre. It is 20 times bigger than the Milky Way galaxy and Andromeda appears longer than the full moon in the night sky. One trillion stars are present in the Andromeda. Age of Andromeda galaxy is 9.006 billion years. Andromeda galaxy is also called the great Andromeda Nebula; Formation of innumerable stars and cosmic dust clouds gave it the name Great Andromeda nebula.
How Was Andromeda Galaxy Formed?
Andromeda Galaxy was formed out of the collision of two smaller galaxies about 5 to 9 billion years ago. Andromeda currently resides within the stellar disc. The stellar disc is relatively flat surrounding the central bulge of the galaxy. The stellar disc comprises much older stars that formed billions of years ago. The stellar discs are of two types - thin and thick discs. Thick disk consists of the older stars and thin disc has the relatively new stars.
Planets Of Andromeda Galaxy:
Two planets are newly discovered in the Andromeda. They are KELT-1b and KELT-2Ab.
KELT (Kilodegree Extremely Little Telescope)-1b is too massive and is located approximately 825 light years away in the constellation Andromeda. KELT-1b is described as a failed star rather than a planet. KELT-1b contains mostly hydrogen and is larger than Jupiter and 27 times more in its mass. Planet surface temperature is 4,000 degrees Fahrenheit. KELT-1b is near the hot star. KELT-1b takes 29 hours for its rotation in orbit.
KELT-2Ab planet is located about 360 light years away in the constellation of Auriga. KELT-2Ab is larger than Jupiter and 50 percent more in mass. KELT-2Ab orbits the star whichis bigger than our sun.