Whitepaper #327 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research. Additional topics: outer heliosphere; fundamental space plasma theory.
We describe compelling open scientific questions and research areas regarding interstellar dust (ISD) grains and their interactions with the heliosphere. Primary open questions include the physical characteristics of ISD, ISD dynamics throughout the heliosphere, and the impacts of ISD on heliospheric structures and composition. Recommendations for future multi-point ISD observations are made.