▲ Picture from: NASA (Unsplash)
▲ The movie "Robots" shows the earth wrapped in a failed satellite
▲ The high-speed debris in space is extremely lethal. Image source: "Interstellar" movie
1. Satellite orbit and frequency resources are becoming scarcer
▲ Schematic diagram of Beidou satellite. Picture from: Beidou Navigation System official website
This is because on April 18, 2000, the ITU approved the frequency and orbit of the navigation satellites declared by China. The "Beidou" satellite navigation system entered the ITU frequency list and officially obtained legal status. However, according to international rules, if it is not used within 7 years of registration, that is, before April 17, 2007, the frequency will expire.
2. Failed satellites are more likely to cause collisions
▲ Pass by
3. The debris after the collision repeatedly causes the above two problems
▲ Debris speculation map produced by European Space Agency
▲ Imagine the consequences of instantaneous breaking of glass
1. abandonment law
2. "Cremation" method
▲ According to the official website of Starlink Project, when the satellite’s life ends, it will use the airborne propulsion system to de-orbit
3. Space burial
4. Active cleaning
In addition to grabbing with a robotic arm, there are methods such as jet nets to capture failed satellites, and laser shooting of failed satellites. It can be said that "conservative therapy" still accounts for the majority, and there are more and more active treatment methods.
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