We study the various head-on collisions of two bunches of D0-branes and their
real-time evolution in the BFSS matrix model in classical limit. For a various
matrix size N respecting the 't Hooft scaling, we find quantitative evidence
for the formation of a single bound state of D0-branes at late time, which is
matrix model thermalization and dual to the formation of a larger black hole.Comment: 30 pages, 21 figure