Why does planets move in elliptical orbit why not in circular orbits?
Why the path of planets is elliptical not circular?
Does the radius of elliptical orbit of planets, or satellites decrease with time? Are the orbits of each planets coplanar? Why don't planets have phases like the moon? Does a planetary orbit depend on the sun? Why does the earth revolve around the sun clockwise and counterclockwise around itself? Do all planets rotate east to west? Why does Uranus not orbit anticlockwise like the rest of the planets? Why is the orbital period of a satellite independent of its mass? What equation of motion does the Earth follow while orbiting the sun? Why so? Why doesn't Jupiter orbit the sun? Why can't we feel the momentum of the earth's spin, nor its orbit around the sun, nor the solar system's orbit around the Milky Way's center? What is the point of all the other planets? Do all planets have to orbit a star? Why is the earth round? What is the difference between inner and outer planets? What's the point of existence of other planets? Why don't planetary orbits violate the law of conservation of energy? Where does the kinetic energy Come from? Is there an equation which can calculate the gravity of the planets and their moons in our solar system simultaneously? According to string theory, why is earth rotating around the sun on an ellipse, while gravitation field of the sun should be almost perfect circle? What is the movement of earth around its axis? How is the gravity of other planets measured? Why is the shape of the known universe not sphere? Rotational energy of a disk not rotating about its centre? Why do some planets have rings? What determines their size and shape? Which direction does the earth rotate and orbit the sun? Why do earth rotate in only one direction? What if the earth begin to rotate in the opposite direction of its orbit? Why is earth rotating so slowly? Why does earth revolve and rotate? Given the trillions of objects orbiting the sun in the Asteroid, Kuiper-Edgeworth and Oort Belts, why haven't more coalesced to form planets?