Why do planets revolve in elliptical orbits and not circular orbits

Imagine yourself in a very huge pool with a centrifugal force spinning very fast that it throws you out at a distance before you're caught by the vortex, now that you're trapped there's a limit to how fast this energy can take you around the center of force, this is your terminal velocity .Draw an invisible line from yourself to the center, according to the universal law of gravitation every object in the universe attracts another object with a force proportional to the product of their mass with a speed proportional to the distance between their center. In relation, your body should not shift any degree from the plane unless you lost or gained an amount of weight. Let's assume you magically gained some heavy weight, now your velocity has been altered and transformed into a variable velocity. The gravitational wave current is to weak to hold extra mass in that regional plane, so now you are attracted to the center of force with an accelerated mass difference but the initial speed of the center force does not change and since your mass is not greater than the center mass in relation to your speed, you will be flung back out until the force weakens and the process will repeat. so they revolve in elliptical and not circular orbits.

Gravity is a force that is inversely proportional to distance squared. Mathematically it can be proven that the only possible closed orbits in such a force is an elliptical orbit. The circle just happens to be a special case of an elliptical orbit.

So take an inverse square force field. It does not have to be gravity. Electrostatic will do, or any force as long as it is an inverse square force. Throw some objects that feel the force into the force field at random. You will observe that all of them except a very few will enter elliptical orbits around the centre of attraction.

That explains why we observe the vast majority of exoplanets moving into elliptical orbits. Circular orbits are very unlikely.