If you look closely, those planets look really small...
The way it is shown (at least from that perspective) those planets cant be more than a foot in diameter.
It is possible he destroyed planets, but a few things:
We don't know how big they were. Why would such a small mouth breathe a fan of air like that? No life on it, according to Superman. So no one powerful or notable were on them.(i.e Darkseid, Saiyans) --- On a quest to get one thread stickied :A: sticky req plz