Which did Kepler notice about planetary motion that caused him to propose Kepler’s first law of orbital motion?(1 point)
Responses
The distance to the sun varies.
The distance to the sun varies.
The distance between Mars and the sun is constant.
The distance between Mars and the sun is constant.
Most planets have highly elliptical orbits.
Most planets have highly elliptical orbits.
The planets have circular orbits.
The planets have circular orbits.