1. BBC News, 2022, Starlink: Why is Elon Musk Launching Thousands of Satellites?, https://www.bbc.com/news/technology-62339835
2. The European Space Agency, 2022, Space Debris by the Numbers, https://www.esa.int/Space_Safety/Space_Debris/Space_debris_by_the_numbers
3. National Aeronautics and Space Administration, 2020, Orbital Debris Quarterly News, Volume 24, Issue 1, pp. 1~16.
4. NASA Orbital Debris Program Office, 2022, Legend: 3D/OD Evolutionary Model, https://orbitaldebris.jsc.nasa.gov/modeling/legend.html (accessed December 30, 2022).
5. RemoveDEBRIS: An in-orbit active debris removal demonstration mission