IAU Centre for the Protection of the Dark and Quiet Sky from Satellite Constellation Interference
CPS
Our mission is to protect the dark sky
The International Astronomical Union (IAU) is deeply concerned
about the increasing number of launched and planned satellite
constellations in mainly low Earth orbits. The IAU embraces
the principle of a dark and radio-quiet sky, not only as
essential to advancing our understanding of the Universe of
which we are a part, but also for the cultural heritage of all
humanity and for the protection of nocturnal wildlife.
The IAU Centre for the Protection of the Dark and Quiet Sky
from Satellite Constellation Interference (CPS) coordinates
collaborative multidisciplinary international efforts with
institutions and individuals and works across multiple
geographic areas to help mitigate the negative impact of
satellite constellations on ground-based optical and radio
astronomy observations as well as on humanity’s enjoyment of
the night sky.
600
Observatories
4550
Satellites
20
Satellite constellations
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