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The diameter of planet Llup is $8600 \text{ km}$. An object on its surface falls at $0.85g$.

What is the mass of Llup?

$2.3 \times 10^{18} \text{ kg}$

$5.3 \times 10^{18} \text{ kg}$

$5.1 \times 10^{24} \text{ kg}$

$2.3 \times 10^{24} \text{ kg}$