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In laboratory experiments we determine the mass gain and loss in central collisions between centimetre‐ to decimetre‐size SiO 2  dust targets and submillimetre‐ to centimetre‐size SiO 2  dust projectiles of varying mass, size, shape and at different collision velocities up to ∼56.5 m s −1 . Dust projectiles much larger than 1 mm lead to a small amount of erosion of the target but decimetre targets do not break up. Collisions produce ejecta, which are smaller than the incoming projectile. Projectiles smaller than 1 mm are accreted by a target even at the highest collision velocities. This implies that net accretion of decimetre and larger bodies is possible. Independent of the original size of a considered projectile, after several collisions, all fragments will be of submillimetre size which might then be (re)accreted in the next collision with a larger body. The experimental data suggest that collisional growth through fragmentation and reaccretion is a viable mechanism to form planetesimals.

High‐velocity dust collisions: forming planetesimals in a fragmentation cascade with final accretion