 For example, a primary impact that is vertical to the body surface may produce early-stage ejection angles of 60°-70°, and late-stage ejection angles that have decreases to nearly 30°.Mechanical properties of a target's regolith (existing loose rocks) will influence the angle and velocity of ejecta from primary impacts.Research using simulations has been conducted that suggest that a target body's regolith decreases the velocity of ejecta.