IHP-1 |
| Mission type | Heliosphere science, planetary flyby |
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| Operator | Chinese National Space Administration |
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| Mission duration | 25 years (planned) |
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| Launch date | Proposed: some time in the future |
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| Closest approach | October 2025 |
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| Closest approach | December 2027 |
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| Closest approach | March 2029 |
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| Closest approach | TBD |
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| Distance | TBD |
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IHP-2 |
| Mission type | Heliosphere science, planetary flyby |
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| Operator | Chinese National Space Administration |
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| Mission duration | 25 years (planned) |
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| Launch date | Proposed: May 2024 |
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| Closest approach | May 2027 |
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| Closest approach | March 2032 |
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| Closest approach | May 2033 |
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| Closest approach | January 2038 |
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| Distance | 1,000 km |
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| Closest approach | January 2038 |
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| Distance | TBD |
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| Closest approach | TBD |
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| Distance | TBD |
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Shensuo (Chinese: 神梭), formerly Interstellar Express, is a proposed Chinese National Space Administration program designed to explore the heliosphere and interstellar space. The program will feature two or three space probes that were initially planned to be launched in 2024 and follow differing trajectories to encounter Jupiter to assist them out of the Solar System. The first probe, IHP-1, will travel toward the nose of the heliosphere, possibly performing a flyby of 50000 Quaoar on the way, while the second probe, IHP-2, will fly near to the tail, skimming by Neptune and Triton in January 2038. There may be another probe—tentatively IHP-3—which would launch in 2030 to explore to the northern half of the heliosphere. IHP-1 and IHP-2 would be the sixth and seventh spacecraft to leave the Solar System, as well as first non-NASA probes to achieve this status.