He invented the first castable, composite solid rocket propellant, pioneered the advancement of both liquid-fuel and solid-fuel rockets, and was an early proponent of using rockets for scientific research and exploration beyond Earth.
He invented. The first castable pioneered the advancement of both liquid-fuel and solid-fuel rockets. The first castable was an early proponent of using rockets for scientific research and exploration beyond Earth. The first castable was composite solid rocket propellant.