Space exploration was aided most by the: a: use of liquidfuel b: discovery of neptune c: creation of the telescope d: acceptance of heliocentric theory

a. use of liquid fuels

The space exploration is a wide field that deals with the study of celestial bodies such as stars, planets and the entire solar system. The study involves the use of the telescopes, robotic space probes and human spaceflight using special spacecrafts. The use of the liquid fuels can aid in the movement of the spacecraft or satellite which can help in the exploration of space, this can bring some relevant information about the various bodies of the space and related to the physical environment of the space. This will help in direct exploration of the space.

hypothesising or postulating

an electric circuit