It's worse than you think. Here's a really interesting article on what it would take to get Epstein drive performance: https://toughsf.blogspot.com/2019/10/the

It's worse than you think. Here's a really interesting article on what it would take to get Epstein drive performance: https://toughsf.blogspot.com/2019/10/the-expanses-epstein-drive.html https://toughsf.blogspot.com/2019/10/the-expanses-epstein-dr... This thing would produce more power than all of civilization does today. No radiator could handle it. They use laser fusion, exploding D-He3 fuel pellets well behind the ship, with a giant magnetic nozzle. A tungsten heat shield protects the ship, and reaches an equilibrium temperature without active cooling.