The warning given by the astronomers
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Astronomers are warning that their view of the Universe could be under threat.
From next week, a campaign to launch thousands of new satellites will begin in earnest, offering high-speed internet access from space.
But the first fleets of these spacecraft, which have already been sent into orbit by US company SpaceX, are affecting images of the night sky.
They are appearing as bright white streaks, so dazzling that they are competing with the stars.
Scientists are worried that future "mega-constellations" of satellites could obscure images from optical telescopes and interfere with radio astronomy observations.
Dr Dave Clements, an astrophysicist from Imperial College London, told BBC News: "The night sky is a commons - and what we have here is a tragedy of the commons."
The companies involved said they were working with astronomers to minimise the impact of the satellites.
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