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How Gravity Slingshots Speed Up Space Probes
引力弹弓如何加速探测器
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A gravity slingshot uses a planet’s motion and gravity to boost a spacecraft’s speed without burning extra fuel.
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As the probe approaches a moving planet, it gains momentum from the planet’s orbital velocity around the Sun.
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This effect works like bouncing a ball off a moving train — the ball leaves faster than it arrived.
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Mission planners carefully calculate the flyby angle, distance, and timing to maximize the energy gain.
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Voyager 2 used slingshots at Jupiter, Saturn, Uranus, and Neptune to visit all four outer planets.
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Without this technique, such long-distance missions would require much larger rockets or decades more travel time.
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The probe’s path bends due to gravity, but its speed relative to the Sun increases significantly after departure.
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Importantly, the planet loses a tiny, immeasurable amount of orbital energy in the process — conservation holds.
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Engineers simulate thousands of trajectories using physics-based software before selecting the final flight plan.
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Today, slingshots remain essential for deep-space exploration, enabling missions that would otherwise be impossible.