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Q.
Which of the following orbits is a possible orbit for a planet?
Gravitation
Solution:
According to Keplers first law, every planet moves in an elliptical orbit with the sun situated at one of the foci of the ellipse. In options (a) and (b) sun is not at a focus while in (c) the planet is not in orbit around the sun. Only (d) represents the possible orbit for a planet.