Milky Way is the galaxy where the solar system is located. It looks like a milky belt that stretches from North towards the South at night once the sky is very clear.  Once viewed on top it comes in spiral shape. However, once it is observed from the side, it is has bulging at the hub and then tapered to the end. Milky Way has diameter of about 0.1 million light years. The thickness in the bulging part, which is the middle is about 15000 – 20000 light years. From the galactic center, the sun is situated about 30000 light years away from it. On about 225 million year with the speed of 250 kilometers per second, the sun finished one revolution around the galactic center.