Which variable has greater influence on the calculated mass of the planet: the semi -major axis or the orbital period? To determine this, double the value of one variable. Then reset the values and double the second variable. 1. The semi-major axis (distance of the moon to the planet) has a greater influence than the orbital period on the calculated mass of the planet. 2.  The orbital period has a greater influence than the semi-major axis (distance of the moon from the planet) on the calculated mass of the planet. 3. The orbital period and the semi-major axis (distance of the moon from the planet) have the same influence on the calculated mass of the planet. 4. Neither the orbital period nor the semi-major axis (distance of the moon from the planet) have any influence on the calculated mass of the planet.

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