2. Which did Kepler notice FIRST about planetary motion that caused him to propose Kepler’s first law of orbital motion?(1 point)

Question

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.

Answer 1

Kepler first noticed that the planets speed up and slow down but cover the same area as they move in their orbits. This observation led him to propose his first law of orbital motion, which describes the elliptical shape of planetary orbits and the varying speeds of planets as they orbit the sun. Therefore, the correct response is:

The planets speed up and slow down but cover the same area.