After the plan was finalized, humanity spent quite a long time preparing.
Only after the new artificial satellites reached a certain number did the unmanned exploration truly begin.
One new artificial satellite after another was launched. At the same time, an unmanned lander carrying several unmanned landing probes plunged into the planet's thin atmosphere and descended toward its designated target.
The unmanned lander continuously lowered its altitude along its preset trajectory, while two Small Vector Fission Thrusters mounted at its tail and another thruster on its belly began operating together.
With mature fission technology, humanity no longer needed to use rocket retro-propulsion to assist with landings as they had in the twenty-first century. Without environmental pollution being a concern, a lander equipped with Fission Thrusters could enter the atmosphere like a small spacecraft and then land steadily at its designated location.
As it drew closer and closer to the ground, four supports angled outward slowly extended from both sides of the lander. Then, after the Vector Nozzles kicked up a cloud of dust, it settled firmly onto the planet's surface.
Ross 154-4 Planet had an average gravity of 7.2 m/s and an escape velocity of 7 km/s, both far lower than Earth's, so the unmanned lander's landing operation was relatively easy.
Once the unmanned lander had stabilized, its side door opened, and a ramp slowly extended from the doorway and pressed into the ground.
Several unmanned probes then slowly crawled down the ramp and began their exploration.
These small probes retained the classic design of ground exploration vehicles. Each consisted of nine systems: structure and mechanisms, integrated electronics, guidance, navigation and control, telemetry and data transmission, mobility, power supply, thermal control, payload, and the Remote Driving Module.
Because nuclear fission thrusters had not yet been miniaturized enough to be installed