Q-PACE was to explore the fundamental properties of low‐velocity (< 10 cm/s (3.9 in/s)) particle collisions in a microgravity environment in an effort to better understand accretion in the protoplanetary disk. Several precursor tests and flight missions were performed in suborbital flights as well as in the International Space Station. The small spacecraft does not need accurate pointing or propulsion, which simplified the design.