If the earth were twice as far from the sun as it presently is,how long (in terms of the present year)would it take it to make one orbit around the sun?
A)2.0 years
B)2.8 years
C)4.0 years
D)5.7 years
E)16 years

Question

Quizplus · Accepted Answer

According to Kepler's third law, the square of the orbital period is proportional to the cube of the semi-major axis of its orbit. If the distance is doubled, the period becomes √(2^3) = √8 ≈ 2.8 times the current period.

If the Earth Were Twice as Far from the Sun