In our solar system sun is gigantic. It has 99% mass of total solar system. Sun is the biggest star within 24 trillion miles in Earth; more than a million Earth can fit inside it.
It is 100thousands times larger than Mercury, Mars, Venus and Earth.
Even the largest planet Neptune, Uranus, Saturn, Jupiter is hardly a match for our sun.
But when we look into the universe even our sun finds difficulty finding its place. From smallest to largest here are some big stars of our endless universe: