* Alice's friends Bob and Charlie are having a race to a distant star 10 light-years away. Alice is the race official who stays on Earth, and her friend Darien is stationed on the star where the race ends. Bob is in a rocket that can travel at 0.7c, whereas Charlie's rocket can reach a speed of 0.866c. Bob and Charlie start to move at the same time. Draw a spacetime diagram from each person’s perspective (four diagrams altogether).
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