This is from Lisa Randall's Knocking on Heaven's Door: So when particles and antiparticles collide they get converted into pure energy. I've always thought of energy as what causes particles to move, for example, a billiard ball with X joules can transfer that kinetic energy to another billiard ball on collision causing it to move. Correct me if I'm wrong. What happens then to the surrounding area when particles and antiparticles collide and annihilate? Does it cause the particles around them to move?