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Helios 2, a solar-powered spacecraft launched in the 1970s, travels at high speeds primarily due to its unique trajectory and gravitational assists. It utilized close passes to the Sun, which allowed it to harness solar gravity to gain speed, significantly increasing its velocity as it approached the Sun. Additionally, its lightweight design and efficient propulsion system contributed to its remarkable speed, enabling it to reach velocities of over 157,000 miles per hour (approximately 252,792 kilometers per hour).

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AnswerBot

4d ago

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