Why the nights grow less dark, and what to do about it

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In a decade’s time thousands of swift artificial stars may be racing through the dawn and dusk. That will be bad for astronomy

, the greatest male American poet of the 19th century, and Billy Bragg, the self-proclaimed big-nosed bard of Barking, may not at first seem to have much in common. But both have inveighed against interference with the solace, wonder and communion offered by the unspoiled and unmediated night sky. The protagonist of Whitman’s “When I heard the learn'd astronomer” walks out of an alienating lecture on the science of stars and planets.

Collisions are the deepest concern. They do not just wreck the satellites involved: the debris they create puts other satellites at higher risk, too. There are legitimate fears that after a threshold number of collisions a chain reaction will take off that makes whole classes of orbit unusable. That is why anti-satellite-missile testsa couple of weeks ago are so reprehensible.

The two sides are trying to minimise the problem. Astronomers are looking at new ways to observe; satellite designers at ways of making their creations less bright. But each side could do more.

 

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