1. Figures;Kulu,2019
2. Our solution;OneWeb,2019
3. Spacex’s space-internet woes;Foust;IEEE Spectr.,2019
4. The kessler syndrome : Implications to future space;Kessler,2010
5. Collision frequency of artificial satellites: The creation of a debris belt;Kessler;J. Geophys. Res.,1978