Now that all the major modules of the CSS have been launched, what's next for the space station?
Furthermore, what is the approximate timeline of the next major launches, missions, etc. for the coming few years?
2023: Xuntian (essentially an upgraded Hubble telescope)
2024: Interstellar Express 1 & 2 (essentially more specialized versions of voyager 1 & 2), fly-by Jupiter and Neptune, Chang'e 6
2025: Tianwen 2: Asteroid sample and return
2026: VOICE Venus probe
2029: Tianwen 4: dedicated Jupiter and Uranus mission
Basically the next 4 years will be slower than the last 4 since the only noticeable step-change will be the Mars Sample Return (Tianwen-3) and manned lunar missions which won't be flown until the late 2028-2029. The manned missions to CSS will be largely "operationalized" and just business as usual.
Does anybody know if China has a Saturn or Mercury mission planned? The planetary probe exploration missions will have higher scientific return on investment with lower risk and cost compared to the manned programs.