  In ballistic annihilation, infinitely many particles with randomly assigned
velocities move across the real line and mutually annihilate upon contact. We
introduce a variant with superimposed clusters of multiple stationary
particles. Our main result is that the critical initial cluster density to
ensure species survival depends on both the mean and variance of the cluster
size. Our result contrasts with recent ballistic annihilation universality
findings with respect to particle spacings. A corollary of our theorem resolves
an open question for coalescing ballistic annihilation.
