  In the coming decade, up to 100 000 satellites in large constellations could
be launched into low Earth orbit. The satellites will introduce a variety of
negative impacts on astronomy observatories and science, which vary from
negligible to very disruptive depending on the type of instrument, the position
of the science target, and the nature of the constellation. Since the launch of
the first batch of SpaceX's Starlink constellation in 2019, the astronomy
community has made substantial efforts to analyse the problem and to engage
with satellite operators and government agencies. This article presents a short
summary of the simulations of impacts on ESO's optical and infrared facilities
and ALMA, as well as the conducted observational campaigns to assess the
brightness of satellites. It also discusses several activities to identify
policy solutions at the international and national level.
