Rockets and satellites get the headlines. But what makes them work? Here are five technologies you've probably never heard of, but they're set to have a big impact on how rockets work and, even, on your electricity bill. We'll hear from the founders of companies working on: the pressure vessels inside every rocket and satellite; a green propellant to replace hydrazine, which can be stored for ten years and restarted in under thirty seconds; the aerospike engine, theoretically superior for sixty years and never yet demonstrated in flight; onboard software that lets satellites decide for themselves what to photograph; satellite data that helps power lines carry more electricity.

Five technologies. None of them famous. All of them essential.

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