介绍了太阳系边界3种定义（即以行星轨道为界、日球层顶为界和太阳引力范围为界）的内涵，阐述了行星际空间和星际空间的区别，探讨了太阳系边际探测的科学目标和关键科学问题，其中包括4个探测任务，即无人区探索、日球层全貌、大行星掠影及太阳系考古。
This paper summarizes three definitions of the solar system boundary, i. e., planetary orbit boundary, heliospheric boundary and solar gravitational boundary, presents the difference between interplanetary space and interstellar space, and discusses the scientific objectives and key scientific problems of the solar system boundary exploration, which includes four missions,namely, exploration of no man's land, panoramic view of the heliosphere, sweeping of major planets, and archaeology of the solar system.
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