Short Wave What Science Fiction Gets Wrong About Space Travel
Jul 14, 2021
Geoff Brumfiel, NPR science correspondent, sheds light on the engineering hurdles of space travel that often get glossed over in science fiction tales. He discusses the stark contrast between cinematic portrayals, like those in Iron Man and Star Wars, and the real-world challenges of propulsion. With insights into thrust and fuel efficiency, Geoff explores innovative technologies, from ion engines to nuclear power, and emphasizes the need for new engineering solutions to make human missions to Mars a reality.
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Iron Man's Thrusters
- Naya Butler-Craig, a rocket scientist and Marvel fan, questions Iron Man's propulsion.
- She wonders how such small thrusters generate enough force for flight.
Basic Rocket Science
- Rocket thrust is generated by expelling mass in the opposite direction of desired travel.
- This principle, Newton's Third Law, applies to all rockets, even fictional ones like Iron Man's.
The Fuel Problem
- Real-world jetpacks and spaceships require large fuel tanks, limiting space for other things.
- The heavier the rocket, the more fuel needed, creating a design challenge.