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The Tianwen-1 (天问一号) spacecraft has successfully observed the dust activity of an interstellar object, according to China’s Lunar Exploration Program (CLEP), which published the announcement on its official portal on 20 May 2026.
Tianwen-1, originally conceived as China’s first Mars mission, delivered the Zhurong rover to the Martian surface in May 2021. The spacecraft has remained active in interplanetary space and was apparently used to observe a passing interstellar object — an opportunity made possible by the probe’s position within the solar system.
Interstellar objects — bodies that originate from outside our solar system — have been a focus of planetary science since the discoveries of 1I/Oumuamua (2017) and 2I/Borisov (2019). According to CLEP, Tianwen-1’s observation of dust activity provides new data on these otherwise difficult-to-access bodies; the brief announcement does not specify the designation, nature, or distance of the observed object.
CLEP states that the findings highlight the scientific value of Chinese planetary probes beyond their primary mission objectives. No follow-up scientific publications on the observational data have been announced so far.