I. Uzay Ekonomisi, Uzay Hukuku ve Uzay Bilimleri, İstanbul, Turkey, 29 - 30 May 2021, pp.151-158, (Full Text)
Satellite constellations constitute significant threat to ground-based optical astronomy as well as radio astronomy. Thousands of satellites are planned to be placed in low-Earth orbit (LEO), and several hundreds of them are planned for higher orbits such as MEO. International astronomical community has been discussing the issue with its all dimensions; need for proper regulations, national space policies, and international agreements. This contribution is intended to define the issue and its impact on astronomical observations.