The flag of australia is a defaced Blue Ensign: a blue field with the union Jack in the canton (upper hoist quarter), and a large white seven-pointed star known as the commonwealth Star in the lower hoist quarter. The fly contains a representation of the southern Cross constellation, made up of five white stars – one small five-pointed star and four, larger, seven-pointed stars. there are other official flags representing Australia, its people and core functions of government.