After the ground end of the first cable for the space elevator was secured, a spaceship roared into the sky, pulling the other end of the cable, and began to ascend, climbing to an altitude of 45,000 kilometers above Ganymede's surface.
The other end of this 45,000-kilometer-long cable extended to this height, fully stretched.
The cable, with a diameter of about 7 centimeters and a length of 45,000 kilometers, seemed as though it would have an extremely high mass, not something a medium-sized spaceship could pull.
But in truth, such a long and thick cable had a total mass of only about 170 tons, which could be fully stretched into space by the current spaceship.
After the stretching work was completed, a heavy spaceship, fully loaded with ballast, flew over at a speed exceeding Ganymede's escape velocity.
Flying at this speed, it should have broken free from Ganymede's gravity and entered space.
But due to the extra thrust from its engines, it remained in place.
