I Am no expert in physics, but just form being entranced by everything that is space related my whole life. can someone please explain something to me. I understand why planets, stars are round or oval in shape (gravity, and magnetic fields) and even solar systems and galaxies are depicted round/oval in pattern but why are most all Galaxies I've seen pictured flat like a pancake? if its gravity and magnetic fields keeping them together as well, wouldn't they look more like a basketball or football than a flat pancake?