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Space

Starlink tests show how to save radio astronomy from satellites

Radio astronomers teamed up with SpaceX to find a promising solution for helping expensive telescopes avoid interference from thousands of Starlink satellites

By Jeremy Hsu

23 August 2024

A radio telescope at the Green Bank Observatory in West Virginia

J. Seymour/Green Bank Observatory

Radio telescopes observing the cosmos face growing challenges because of electromagnetic interference from thousands of satellites in low Earth orbit. Now, experiments involving SpaceX’s Starlink satellites have shown how to virtually eliminate one form of this problem.

As these kind of satellites hurtle around the planet, they send so-called downlink signals to Earth to provide internet and communication services. When they pass through areas of the sky where radio telescopes are observing, the temporary blips from those strong signals can potentially impact hours of…

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