Space Debris

As the number of satellites in earth's orbit continues to increase, space debris will eventually pose a severe hazard to near-Earth space activities if they are not well monitored and controlled. An estimated 900,000 pieces of space debris are floating in space, including old satellites and tools discarded by astronauts. Effective measures should be taken to mitigate this hazard (Venturelli, P., & Velasco, A. M. (2011). A method for addressing the danger of space debris. 2011 Aerospace Conference,). Generally speaking, if an on-orbit spacecraft collides with space debris larger than 10 cm, it will be disastrous. This space debris often makes the flying spacecraft have to take measures to avoid collisions to ensure their own safety.