27. According to Kepler’s third law, (a) Mercury travels fastest in the part of its orbit in which it is closest to the Sun. (b) Jupiter orbits the Sun at a faster speed than Saturn. (c) all the planets have nearly circular orbits.

(b)

Explanation:

According to Kepler’s third law, Jupiter orbits the Sun at a faster speed than Saturn.

This law was published in 1619.

Kepler's laws refer to the three scientific laws that describe the motion of planets around the Sun.

He made a major break from ancient beliefs when he abandoned circular orbits in favor of elliptical orbits.

8 km/h

Explanation: