2. Which did Kepler notice FIRST about planetary motion that caused him to propose Kepler’s first law of orbital motion?(1 point)
Responses
The planets have circular orbits.
The planets have circular orbits.
The distance between Mars and the sun is constant.
The distance between Mars and the sun is constant.
The planets speed up and slow down but cover the same area.
The planets speed up and slow down but cover the same area.
Most planets have highly elliptical orbits.
1 answer
Kepler first noticed that the planets speed up and slow down but cover the same area. This observation led him to propose Kepler's first law of orbital motion, which states that planets move in elliptical orbits with the sun at one of the foci. Therefore, the correct response is:
The planets speed up and slow down but cover the same area.
