@DBZ_universe: C'mon, he's not a galaxy buster, it's impossible. No one in DB is anything more than a Multiple Planet Buster/Sun Buster. You can check that in OBD if you need further proof or just watch the anime/read the manga more carefully. Yes that feat was shown but you do understand that if that feat was true, then Broly would be 1,000,000s of times more powerful than a SSJ4.
I don't want to get into the whole "How strong is Broly" debate, but that one feat is a massive outlier. Even Omega Shenron's strongest attack exploded harmlessly outside the Earth's atmosphere and he's strongest villain in all of DB. Baby was blasted into the Sun but the Sun didn't explode. Most of the time you can see them charging up attacks yet the attacks are only mountain buster level. If they truly were Galaxy level, then a normal ki blast would easily destroy the Earth etc etc.
Edit: Let's say they are casual sun busters for arguement's sake. Now let's put this up to scale.
Diameter of Sun = 800,000 miles. Distance from Pluto to the Sun = 3,666,000,000 miles. Pluto's not even the edge of the solar system but it's clear to see the vastness of the solar system in comparison to sun.