A probe is launched from Earth and lands on Mars. The gravitational acceleration on Mars is 3.7 m/s2.

Mass measures how much matter the probe contains, so it remains the same when the probe travels from Earth to Mars. Weight depends on gravitational acceleration: weight equals mass multiplied by gravitational acceleration. Since Mars’s gravity is 3.7 m/s², less than Earth’s roughly 9.8 m/s², the probe’s weight decreases. The correct choice is B: the mass remains the same, but the weight decreases.

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