> there is a kind of relativistic Tsiolkovsky equation for mass-energy propulsion vehicles that carry their own fuel Yes, it's called the relativistic rocket e

> there is a kind of relativistic Tsiolkovsky equation for mass-energy propulsion vehicles that carry their own fuel Yes, it's called the relativistic rocket equation. https://math.ucr.edu/home/baez/physics/Relativity/SR/Rocket/rocket.html https://math.ucr.edu/home/baez/physics/Relativity/SR/Rocket/...