Fig. 1: Pebble-sized particle clusters.
From: The growth of super-large pre-planetary pebbles to an impact erosion limit
a, Largest cluster formed in the experiment. It was about 3 cm in length. Unfocused grains are particles at the front window. For reference, individual grains are 0.5 mm. b,c, Numerical simulations of impacts at 0.5 m s−1. The impactor and ejected grains are marked in red. c, With a weak charge, some grains were ejected. b, With a strong charge, no particles were ejected and only the impactor is seen.
