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你知道火星离地球究竟有多远吗？
Do you know how far Mars is from Earth?
火星是离太阳第四近的行星，其物理性质和化学性质与地球最相近。
Mars is the fourth planet from the sun. It has the most similar physical and chemical features as Earth.
地球和火星最远距离约4亿公里，最近距离约5600万公里。
The farthest distance between the Earth and Mars is about 400 million kilometers, and the nearest about 56 million kilometers.
要想向火星发射探测器，受天体运行规律约束，大约每隔26个月才有一次发射窗口。
Based on the orbit Mars is traveling and the capability of mankind, only one launch window is open for Mars every 26 months.
目前人类已经实现火星飞跃、环绕、着陆、巡视探测，个别探测器实现了着陆、巡视探测。
Human beings have achieved Mars fly-bys, orbiting, landing, and patrol exploration. Few spacecraft can land and carry out patrols on Mars.
中国人的火星探测方案则计划一次实现“绕着巡”的方案，不仅要环绕，还要着陆，并且实现巡视探测。
China's Mars exploration plan aims to achieve three goals: to finish Mars orbiting, landing and patrols in one mission.
2020年夏天，中国首次火星探测“天问一号”任务开启。从地球到火星的飞行任务全过程可以分为为六个步骤：发射、地火转移、火星捕获、火星停泊、离轨着陆和科学探测。
China eyes to launch first Mars probe in the summer of 2020. There are six steps for the Mars probe to go from Earth to Mars: to launch the spacecraft, to finish the Earth-Mars transfer, to get the spacecraft caught by Mars, to enter an orbit, to land on Mars, and finally to carry out scientific research.
漫长的飞行过程，每一步都有任务在身，这是一场极不平凡的宇宙之旅，承载着中国行星探测的梦想。星辰大海，永不止步，为中国“天问一号”加油！
Every step counts during the long flight. This is an unusual space travel undertaking of China's dream to explore the planets. To the stars and beyond, go for it Tianwen-1! |
发表于 2020-7-25 10:26:12
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发表于 2020-7-25 15:42:33
