another reason why all plannets are round is because the forces of magnetic energy from a nearby star, like our sun, will pull from all sides of the plannet when a plannet is floating in gravity, in its early stages of forming the magnetic energy of a near by star will make the plannet spin.
And pull on all sides of a plannet, this is how all plannets are formed in the best understanding of scientific knowledge.
The theory of gravitational pull is a scientific understanding that may well be proven right.
But I have to say it could be the best theory for Gods design to..