dude like I said the people that don't watch dbz prove it in their posts.
magee the freeza blast thing happened in the episode right after goku transformed into a super saiyan for the first time, Even though his power was sufficiantly weaker than usual (cause he had been fighting all day) he easily dodged all of freeza's death beams, when freeza asked why he couldn't hit goku goku said it was cause he didn't say please. Freeza screams "please" as he unleashes a death beam at goku's head. Goku took a direct hit to his face and it just pushed his head back.
you're right about the sun thing, goku just draws power from living things on the planet he's on ect.
Goku can destroy an entire galaxy in a matter of moments, In the DBZ universe, it is divided into four hemisphere's of galaxies, (north, south east, and west,) in movie 8 one of these galaxies is completely obliterated by brolly the legendar super saiyan and everyone is scared he'll do it to the other galaxies as well. Everyone can assume goku can do the same simply based off comparison, (ex- if spiderman can lift a car, hulk can lift a car) because by the end of the z saga goku is far and above the power level brolly had. by the end of the GT saga he's insanely more powerful than the end of the z saga....hence, goku can destroy a galaxy in a matter of moments. hell in the cell saga trunks killed king cold who was terrified and confused because he had enough power to destroy an entire solar system and trunks was just toying with him,,,,and that was when trunks was a comparitive weakling, he couldn't even last five minutes with the androids much less go toe to toe with a perfect cell.
Just because a galaxy is enormous doesn't mean he can't do it...logic simply doesn't apply to dbz, like it was stated before the charactor's clothes get stronger as they get stronger..wtf? and a normal person learns how to fly through meditation of the course of a summer (videl)...yeah whatever, (I know I've learned how to fly through meditation too). and a species like freeza has adapted to be able to survive without breathing yet he still has a nose...and what a cute little nose it is.
Goku rocks Superman
Someone make a superman vs. Android 17 fight were android 17 isn't going to blow up the earth, at least that would be interesting.