Rockets are made of all sorts of different materials! Depending on what it’s doing, they have heat shields and ceramic tiles that protect astronauts. They have a lot of jet fuel to help them get to space! They have cool robotic arms made of alloy metals (lots of metals together) that help them grab things!
There’s a really funny comic explaining a rocket using only the 1000 most common words in the English language. It’s pretty funny! https://xkcd.com/1133/
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