Group 1 - The Tianwen-2 mission is China's first asteroid sample return and main belt comet flyby mission, named as the second in the Tianwen series of planetary exploration tasks [3][5] - The mission aims to explore two small celestial bodies: asteroid 2016 HO3, known as a "quasi-satellite" of Earth, and main belt comet 311P, which has characteristics of both asteroids and traditional comets [7][9] - The exploration of small celestial bodies is significant as they contain primordial information about the solar system's formation and evolution, and can help identify potential threats to Earth [5][7] Group 2 - The Tianwen-2 mission will attempt innovative anchoring and touch sampling techniques, potentially making it the first spacecraft to use this technology on an asteroid [9]