How do we combat the challenge of using most of the fuel for a space mission during the launch

Solar panels This panel is capable of converting sunlight directly into electricity, which can be used to power the systems that make up the life support systems. As a space craft gets further from the sun the amount of radiant energy available to the solar panels decreases by the square of the distance. This means that the area of solar panels must be increased greatly for any missions with astronauts to places like Mars, because it is further away from the Sun.