The equation tsquared=acubed shows the relationship between a planet’s orbital period, t, and the planet’s mean distance from the sun, a, in astronomical units, au. if the orbital period of planet y is twice the orbital period of planet x, by what factor is the mean distance increased?
1. 2 ^1/3
2. 2^1/2
3. 2^2/3
4. 2^3/2