Discussion
All planets move around the sun in elliptical orbits, with the sun being at rest at one focus of the orbit.
Answer: A
True. This is Kepler's first law, the law of orbits.
Each planet moves in an ellipse with the sun at one of the two foci. The orbits of the planets are very nearly circular - the earth's eccentricity is only 0.017 - which is why the departure from a circle went unnoticed until Kepler analysed Tycho Brahe's observations of Mars.
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