Sutherland, H. 2021, Spaceflight and the Environment: NASA’s NEPA Process, Vermont Journal of Environmental Law, accessed 9 October 2021 https://vjel.vermontlaw.edu/spaceflight-environment-nasas-nepa-process
United Nations Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies, 1967. https://www.unoosa.org/oosa/en/ourwork/spacelaw/treaties/introouterspacetreaty.html
UN COPUOS 2021, Guidelines for the Long-Term Sustainability of Outer Space Activities of the Committee on the Peaceful Uses of Outer Space, accessed 9 October 2021 https://www.unoosa.org/oosa/en/ourwork/topics/promoting-space-sustainability.html https://www.unoosa.org/documents/pdf/PromotingSpaceSustainability/Publication_Final_ English_June2021.pdf
Walbeek, T. J., Harrison, E. M., Gorman, M. R. & Glickman, G. L. 2021, Naturalistic Intensities of Light at Night: A Review of the Potent Effects of Very Dim Light on Circadian Responses and Considerations for Translational Research, Front. Neurol., 1 February 2021, https://doi.org/10.3389/fneur.2021.625334
Wiltschko, W., Daum, P., Fergenbauer-Kimmel, A. & Wiltschko, R. 1987, The Development of the Star Compass in Garden Warblers, Sylvia borin, Ethology, January–December 1987. https://doi. org/10.1111/j.1439-0310.1987.tb00939.x
