Amazon Is Going to Fill the Sky With Satellites. Astronomers Aren’t Happy“BlueWalker was a shock to us as to how bright it was. We are also very worried about the impact to radio astronomy,” since one of its downlink frequencies is next to a protected radio band at 42.5-43.5 gigahertz, says John Barentine, one of the study’s coauthors and a conference attendee. A Tucson, Arizona-based astronomer, he is also the executive officer of Dark Sky Consulting, which advises companies and government officials on outdoor lighting to preserve dark night skies.
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