Does the plane just break apart or is there an explosion? Because if there is, you could have a complete Lego plane flying into the asteroid up until it hits. Then you can hide the plane. Timed right, you won't see the plane vanish because of the resulting fireball. Then you could just instance all 130 pieces of the Lego plane onto a particle object and add a filed or to and have watche them fly off. Now if you don't have an explosion... Maybe an odd camera anlgle to hide the switch? Just a suggestion...