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Last July 23, 2020, China launched its Tianwen-1 space mission to bring their rover, named Zhurong, to Mars.
Zhurong landed on Mars on May 14, 2021. Mars moves at 27 km/s with respect to Earth. If an Earth-based
observer shines a laser at Zhurong and is reflected back to Earth, the Earth-based observer will measure the speed
of the reflected beam to be
O C
O c + (27000 m/s)
O c (27000 m/s)
O c/ (27000 m/s)

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