The night sky, a canvas of cosmic wonder, is under threat. A recent study has revealed a concerning development: Amazon's internet-beaming satellites, part of their ambitious LEO constellation, are bright enough to disrupt astronomical research. But here's where it gets controversial...
The study, conducted by astronomers at the IAU Center for Protection of the Dark and Quiet Sky, analyzed over 2,000 observations of Amazon's LEO satellites. It found that these spacecraft exceed the brightness limit set by the International Astronomical Union, a limit designed to ensure satellite constellations don't interfere with astronomical observations.
Dr. Anthony Mallama, the lead author of the study, explains, "Bright satellites can be a real nuisance for large-scale surveys conducted at ground-based observatories, like the Vera C. Rubin Observatory. They can even interfere with orbiting observatories like the Hubble Space Telescope."
Mallama and his team have previously studied the brightness of other satellite networks, including SpaceX's Starlink and AST SpaceMobile's BlueBird arrays. They found that while Amazon's LEO satellites are dimmer than the BlueBirds, they are still brighter than the IAU-recommended limit.
"The Amazon Leo constellation, formerly known as Project Kuiper, is a step in the right direction compared to some other satellite networks," Mallama notes. "However, future Amazon Leo satellites are expected to orbit at lower altitudes, which could increase their brightness further."
John Barentine, an astronomer at the Silverado Hills Observatory, adds, "The Amazon Leo satellites appear particularly bright during twilight."
Amazon began launching its internet constellation in 2025, and while only 180 satellites are currently in orbit, the company plans to expand to over 3,200 spacecraft.
Despite the potential impact on astronomy, Mallama praises Amazon for its collaboration with astronomers. "Satellite operators like Amazon and SpaceX are engaging with the astronomical community to reduce satellite brightness. Methods include making spacecraft undersides mirror-like to reflect sunlight into space, and orienting components to avoid direct sunlight reflection towards Earth."
Barentine agrees, "Amazon's engineers have successfully reduced the amount of light reflected by their satellites, making them less visible in the night sky."
The issue of satellite megaconstellations and their impact on astronomy has been a growing concern since the launch of SpaceX's Starlink satellites in 2019. Astronomers have raised alarms about the streaked images caused by satellite trails, and while SpaceX has worked to reduce brightness, other constellations, like China's Qianfan and Guowang projects, are also exceeding IAU limits.
So, what's the solution? Can we have both internet connectivity and dark skies for astronomy? It's a delicate balance, and one that requires continued collaboration between satellite operators and astronomers.
What do you think? Should we prioritize internet access or protect our view of the cosmos? Let us know in the comments!
