Fig. 4From: Regolith behavior under asteroid-level gravity conditions: low-velocity impact experimentsPRIME-3 hardware. a The payload structure that is bolted to the aircraft floor and holds the eight impact boxes (only four are visible in this front view). b Interior of an impact box showing the regolith tray and the launch mechanism. During an experiment run, the tray door rotates to open (1) before the projectile gets launched towards the regolith bed (2)Back to article page