Why does Australia have 6 stars, and why are the stars different sizes?

Answer 1

There are five stars in the constellation of the Southern Cross. The least bright of the five stars is represented by a smaller star than the other four. The big seven pointed star beneath the Union flag is the Federation star with one point for each of the six States and one for all the territories.

Answer 2

Their national flag is decorated by the Southern Cross constellation.The stars vary in brightness,that's why some are big;and some are small.

Answer 3

I think that they are for the Australian States and indicate size in area!