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is the orbital period of the Earth
is the distance of the Earth from the Sun
is the orbital period of the second planet![\frac{r_2^3}{T_2^2}=\frac{r_1^3}{T_1^2}\\r_2 = \sqrt[3]{\frac{r_1 ^2 T_2^2}{T_1^2}}=\sqrt[3]{\frac{(1 AU)^3(8 y)^2}{(1 y)^2}} =4 AU](/tpl/images/0026/5233/266a0.png)
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