Who is the pioneer of the space movement?

The pioneer of the space movement is often regarded as Konstantin Tsiolkovsky, a Russian scientist and engineer who laid the theoretical groundwork for rocketry and space exploration in the early 20th century. His work on the rocket equation and concepts of space travel inspired future generations of scientists and engineers. Tsiolkovsky's ideas, along with those of other early visionaries like Hermann Oberth and Robert Goddard, significantly contributed to the development of modern astronautics.