The Perseus Arm is one of two major spiral arms of the Milky Way galaxy. The second major arm is called the Scutum-Centaurus Arm. The Perseus Arm begins from the distal end of the long Milky Way central bar. Previously thought to be 13,000 light-years away, it is now thought to lie 6,400 light years from the Solar System.
The Milky Way is a barred spiral galaxy with two major arms and a number of minor arms or spurs. The Perseus Spiral Arm, with a radius of approximately 10.7 kiloparsecs, is located between the minor Cygnus and Carina-Sagittarius Arms. It is named after the Perseus constellation in the direction of which it is seen from Earth.
There is speculation that the local spur known as the Orion-Cygnus Arm, which includes the Solar System and Earth and is located inside of the Perseus Arm, is a branch of it, but this is unconfirmed.
The Perseus Spiral arm contains a number of Messier objects: