Whitepaper #070 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research. Additional topics: planetary magnetospheres; planetary ionospheres / upper atmospheres.
Studying planetary systems with Heliophysics objectives, comprehensive instrumentation, and new opportunities for analysis and modeling would enable a novel understanding of fundamental and universal processes of space plasma physics. As such, the community should be prepared to consider, prioritize, and fund dedicated efforts to planetary targets to study space physics and aeronomy objectives.