Due to some reason, if the average distance of the earth from the sun decreases, will the length of a year increases or decrease ? Give reasons for your answer .

Explanation

If the average distance of the earth from the sun is r and the time period of revolution of the earth around the sun is T, then from Kepler.s law `T^2 prop r^3`. Hence, with the decrease in r, the span of a year (T) would decrease.