Q. Why all planets revolve around the sun in elepitical orbit? Except Mercury and venus
Answers
A circular orbit is a special case of an elliptical orbit created when you get the speed and angle exactly right. If a planet is, at any instant, travelling too fast for the orbit it is in, it flies out - and in doing so, slows down. If it is travelling too slow, is falls in - and speeds up. These two effects, alternating, make an ellipse. If it is at just the right speed, it does neither and makes a circle.
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Keplar’s law says that all planets revolve around the sun in elliptical path. Actually shape of path of orbit depends upon the eccentricity of the path or orbital .when eccentricity of path is equal to zero then path must be circular . but when eccentricity of path between zero to 1 then path won’t be circular .keplar sir found eccentricity of many planets orbitals ,he got all planets eccentricity not equal to zero.(see the figure).
This means planets don’t revolve around the sun in the circular path.
Now by mathematics, we know that when eccentricity increases from zero to 1 .i.g. e belongs to (0,1), then elliptical shape increases from circular shape .now see figure and we observe that all eccentricity of all planets except Mercury and Pluto are closer to zero. It means the path of all planet except Mercury and Pluto is approximately circular ( or neither circular nor elliptical ).but we can’t neglect here the small value of eccentricity because all particle have very big shape (in 10^3 km range).so, we can say that path of all planets will be nearly elliptical.
Conclusion:- all planet revolves around the sun nearly elliptical. In case of mercury and Pluto (comparatively high values of eccentricity of other planets)revolve more precise elliptical path.
