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Presenter Greg Foot demonstrates that a star is just like a continuous chemical reaction where hydrogen is converted into helium and produces all the elements that exist on Earth. Greg begins by performing the thermite reaction between iron oxide and aluminium powder, in order to demonstrate that some chemical reactions can release large amounts of heat and light energy. He explains that stars do not consist of iron oxide and aluminium but instead consists of plasma that transfers huge amounts of light and heat energy.

Greg then demonstrates how to make plasma using a candle and a microwave oven. The microwave energy strips electrons from the hot gas from the candle flame, creating an ionised gas called plasma. Just like a tiny star, the plasma emits both light and heat energy.