How the Earth Regained Its Spherical Shape Over Time

Swapil says after a massive asteroid collided with our planet resulting in a substantial loss of material in the formation of our moon How did the earth regain its spherical shape over time? Additionally do all the planets in our solar system have the same round shape as depicted in pictures and textbooks see yeah. One of the prime theories one of the main theories About how the moon was formed is that there was an ancient protoplanet In the very early solar system that collided with the earth It was most likely a glancing collision a huge amount of material was ejected out of The surface of the earth because of this collision which eventually coalesced to form the moon.