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.Read more
Black Hole explanation Black hole is a place in the space where is a great amount of matter is packedRead more