In all galaxies, are the stars and planets round?
Gravity is what makes planets and stars round. If a cloud of gas attains sufficient enough gravity, it condenses into a ball or planet. Because gravity is something that exerts an equal amount of force on all sides, finding for example a square planet would be impossible. Also remember that although planets are round, they are for the most part, not perfectly round. The closest thing to perfectly round planets and stars (Stars and planets that don’t have things like mountains and high elevations) are neutron stars because they are so so so small, but weigh so much more than our sun. For example a neutron star could be the size of NYC, but because it weighs about 5 times what our sun weighs, a tea spoon of dirt from its surface would weigh several million pounds. Because gravity is so much, the star is perfectly round. Earth is not perfectly round.
