Which concept was NOT a part of Kepler's Laws of Planetary Motion?. Physics & Astronomy

All planetary orbits are ellipses
The line that connects the Sun to Mercury sweeps out the same area in a month as does the line connecting us to the Sun.
Epicycles are needed to explain the varying brightnesses of the planets
A planet must move fastest in its orbit at perihelion
The square of the planet's period is equal to the cube of its average distance.

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