太阳系的正上方和正下方，究竟藏着什么？

参考文献：

[1] ESA. Solar Orbiter Mission Factsheet.

[2] ESA. Solar Orbiter's world-first views of the Sun's south pole, 2025.

[3] ESA. Solar Orbiter's journey around the Sun.

[4] Opher, M. et al. A small and round heliosphere suggested by magnetohydrodynamic modelling of pick-up ions. Nature Astronomy, 2020, 4: 675–683.

[5] NASA. Solar Cruiser: Enabling new vistas for Heliophysics Science.

[6] NASA Technical Reports Server. The High Inclination Solar Mission (HISM).

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