Which is the largest galaxy?

Which is the largest galaxy?
Found just about a billion light-years away, IC 1101 is the single biggest cosmic system that has ever been found in the detectable universe. Exactly how expansive is it? At its biggest point, this cosmic system stretches out around 2 million light-years from its center, and it has a mass of around 100 trillion stars. 

You are one of the billions of individuals on our Earth. Our Earth circles the Sun in our Solar System. Our Sun is one star among the billions in the Milky Way Galaxy. Our Milky Way Galaxy is one among the billions of cosmic systems in our Universe. 

Researchers don't know precisely. The biggest cosmic systems we are aware of are monster curved (oval) worlds situated amidst an entire gathering of galaxies.One of the biggest is in the focal universe in the bunch Abell 2029.