Since millennia the silent and ordered beauty of the night sky has inspired humankind in all its intellectual and emotional expressions: poetry, philosophy, religion and science. In particular, modern science is deeply indebted to the observation of  astronomical phenomena as all its major progresses, from the theory of universal gravitation to general relativity, were stimulated and verified by careful observation of the sky.
Today, technological progress, in particular artificial illumination of urban areas, has made it more and more difficult to observe the night sky in its pristine magnificence. Also, remote sites chosen to host the most sophisticated astronomical observatories because of their favourable location, are becoming gradually endangered by light pollution, radio signals interference and artificially induced climatic modifications. More recently, an additional negative impact on the observation of the night sky emerged from visual interference of the mega constellations of artificial satellites in low earth orbit.
Access to the electromagnetic signals emitted by all objects in the universe is not only  instrumental for understanding the cosmos and the overall progress of Science, but the visibility of the starred sky is a fundamental human heritage that must be preserved with painstaking care and love for future generations. Losing it, would disconnect us forever from the Cosmos and Nature.
The United Nations Office for Outer Space Affairs and Spain, jointly with the International Astronomical Union (IAU) are organizing an online Workshop on the topic of "Dark and Quiet Skies for Science and Society". This online event is replacing the Conference initially foreseen in October. The face to face Conference is postponed to 19-23 April 2021 and will be hosted by the Instituto de Astrofísica de Canarias (IAC) at Santa Cruz de La Palma, Canary Islands, Spain. Further details will be given in due time. 

In the recent past, several similar events have been organized with the aim of analysing the threat of light and radio pollution to astronomy and to  the visibility of the pristine night sky. In particular, the conference organized in 2017 in La Palma, on the 10th anniversary of the Starlight Declaration, approved a number of recommended resolutions. In order to make these recommendations more effective, the present Workshop is organised under the auspices of the Committee on the Peaceful Uses of Outer Space (COPUOS). The event will result in a document that describes what measures Governments and private enterprises can adopt to mitigate the negative impact of technological implementations on astronomy (e.g. urban lighting, radio broadcasting and satellite constellations’ deployment) without diminishing the effectiveness of the services they offer to citizens. The final document will be presented to COPUOS for endorsement, to become a reference for regular future analysis of the situation. The involvement of COPUOS is particularly important since it is the natural international forum where these matters should be brought to the attention of the World Governments.

Background information on the Organising Entities

The United Nations Office for Outer Space Affairs (UNOOSA) is the United Nations office responsible for promoting international cooperation in the peaceful uses of outer space. UNOOSA serves as the secretariat for the General Assembly's only committee dealing exclusively with international cooperation in the peaceful uses of outer space: the United Nations Committee on the Peaceful Uses of Outer Space (COPUOS). 

The  International Astronomical Union (IAU), founded in 1919, is the world’s largest professional organization for astronomers, bringing together 14 000 professional astronomers from more than 100 countries worldwide.  Its mission is to promote and safeguard the science of astronomy in all its aspects, including research, communication, education and development, through international cooperation. Structured into Divisions, Commissions, and Working Groups, the IAU has as one of its priority goals, the reduction and prevention of artificial sky glow and radio interference. As such Commission B7 was established to address these critical issues.

The Instituto de Astrofísica de Canarias runs two observatories, in Tenerife and La Palma, and is interested in preserving "Dark and Quiet Skies" for the benefit of Society and of the Astronomical community.