We just learned about the Multi-stage Rocket.
Another part of rocket science is the Shock Diamond.
When a rocket engine is pushing itself along, the burned up rocket fuel coming out of the nozzle is the exhaust.
This exhaust sometimes is coming out faster than the speed of sound, which is called supersonic speed.
When something is moving through the air it is making waves, and when it moves at supersonic speeds it makes these special diamond shapes in the exhaust called shock diamonds.
This is all because the waves that the exhaust is making are moving faster than the sound waves can move, so they overlap and make shapes that you can see.
(from: wikipedia - shock diamond)
Kid Facts - Blast from the past: Mainshock
