"Tsiolkovsky rocket equation#Applicability" . "exponentially increasing fuel requirements" . . "Tsiolkovskiy equation" . . "ideal rocket equation" . "exponentially" . . . . . "rocket equation" . "Tsiolkovsky_rocket_equation" . . . "Specific energy change of rockets" . . "the energy computed from the rocket equation" . . . "Basic Rocket Equation" . "Tsiolkovsky rocket equation" . . "Tsiolkovsky rocket equation" . "derivation of the Tsiolkovsky rocket equation" . .