The orbits of planets around the sun are:
(1 Point)
Circular
Parabolic
Elliptical
Answers
Answer:
Elliptical
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Explanation:
Orbits are eliptical because of Newtons Law of Gravity (bodies attract each other in proportion to their mass and inversly proportional to the square of the distance between them). All worked out by Kepler some years ago. A circular orbit is a special (and very unlikely) case of an eliptical orbit.
Bob Kirk, Bangkok, Thailand
Yes. Isaac Newton. Read his Principia Mathematica.
Peter Brooke, By Kinmuck, Scotland, UK
It's not easy to arrange a perfectly circular orbit for an inverse-square law - just a small tweak (either in the initial conditions, or from interplanetary interactions or impacts) will change the path from a circular orbit to an elliptical one. But, if you look at an ellipse from the right angle, it will appear circular. So, consider it a matter of viewpoint!
Michael Hall, Canberra, Australia
The shape of planetary orbits follows from the observed fact that the force of gravity between two objects depends on the square of the distance between them. If you double the distance between two objects, the attractive force between them drops to a quarter of it's original value. If you triple the distance it drops to a ninth. Isaac Newton demonstrated mathematically that this law implied that the path followed by an object in a gravity field would be a parabola, a hyperbola or an ellipse. The first two are open ended. If something entered the solar system on a parabolic or hyperbolic path, we would see it just once before it disappeared into the distance. Prior to Newton, Kepler showed by measurement that the observable planets had elliptical orbits. Ellipses are closed so the planets we see in elliptical orbits stick around. A circle is a special case of an ellipse and it is theoretically possible for an orbit to be circular. In the real world, a such an orbit is unlikely.
Mike Burton, Twickenham, U