Q

Which statement is not one of Kepler's laws? A. Planets orbit in ellipses with the Sun at one focus. B. All planetary orbits are coplanar. C. The Sun-planet line sweeps equal areas in equal times. D. Orbital period squared is proportional to semi-major axis cubed.

RRB RPF SI 09/12/2024 / Shift III 2024
✓ Answer: C B
Statement B is not a Kepler law. The three laws concern elliptical orbits, equal areas and T² ∝ a³.
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