As a significant impetus to explore the unknown, space science addresses fundamental science questions such as the origin and evolution of the universe and life, kinetic properties of matter, and the relationship between solar system and human beings. Space scientific satellite, an important means to achieve scientific breakthroughs and space technology and application development, aims to address the above-mentioned fundamental science questions. Compared with developed space countries, China is still lagging behind in space science. However, China has laid certain foundation on space research for leap-frog development after fifty-year development. Strategic Priority Program (SPP) on space science is dedicating to deepen our understanding of the universe and planet earth, seeking new discoveries and new breakthroughs in space science via the implementation of both independent and co-operational space science missions. The implementation of the SPP on space science will not only promote the development of China’ s space science, of great significance to China’ s status in international space community, but also turn a new page of Chinese space endeavor.

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