The synchronous orbit is also more stable and has almost no atmospheric resistance, so the spacecraft can be in a safe and stable orbital environment.
According to foreign media reports, the US Defense Advanced Research Projects Agency is developing an intelligent robotic arm that can serve as a transportation hub on the space station. Pammelroy, deputy director of DARPA's Tactical Technology Office, former NASA astronaut, considers this a space capability, not just a function of a monolithic satellite, but a variety of orbital tasks that can be performed, such as transportation, Maintenance, refueling, etc., the extension direction is a multi-functional transportation hub on the track. On the 36,000-kilometer track, we will build a port that is almost in sync with the Earth's rotation and hovering over somewhere on the planet.
In comparison, the altitude of the low earth orbit is about 300 to 600 kilometers, which is also the height of the current international space station. The orbital environment here may be less optimistic, and the danger of encountering space garbage is greater than that of the synchronous orbit. At the same time, the synchronous orbit is more stable, and there is almost no atmospheric resistance, so the spacecraft can be in a relatively safe and stable orbital environment. If the spacecraft in the low Earth orbit does not ascend the orbit, then it will fall back to Earth in about 25 years, and the spacecraft in synchronous orbit can be kept at least 1 million years without lifting the orbit.
It sounds like a synchronous track is the place to house the transportation hub infrastructure because it is more stable, but the radiation environment may not be as optimistic. The height of the synchronous track of 36,000 kilometers is close to one tenth of the distance of the earth and the moon, so the radiation level is also high. After leaving the protection of the earth, astronauts can't move in such an environment for a long time, so the automatic robot is the only choice. The advanced robotic arm is similar to the robotic arm used on the International Space Station, but with a higher degree of automation and safety.
At present, the US Defense Advanced Research Projects Agency is developing such a robotic arm to establish a rail transit hub, covering from near-Earth orbit to synchronous orbit, and even has the ability to transcend Earth's orbit.
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