The night sky is under threat, and it's not just from light pollution. A new study reveals that Amazon's ambitious plan for internet-beaming satellites might have a disruptive impact on astronomy. But here's the twist: these satellites are designed to bring connectivity to remote areas, yet they could hinder our understanding of the cosmos.
The research, available on Arxiv, analyzed nearly 2,000 observations of Amazon's LEO (Low Earth Orbit) satellites and found that they exceed the brightness limit set by the International Astronomical Union (IAU). This limit is crucial for ensuring that satellite constellations don't interfere with our view of the universe.
The study's lead author, Anthony Mallama, highlights a critical issue: these bright satellites can significantly disrupt ground-based observatories like the Vera C. Rubin Observatory and even orbiting telescopes like the Hubble Space Telescope. And this is the part most people miss—the impact extends beyond just the satellites' immediate vicinity.
Mallama and his team have previously studied other satellite networks, including SpaceX's Starlink, the largest constellation in orbit, and AST SpaceMobile's BlueBird satellites, which are the brightest artificial objects in the night sky. Interestingly, Amazon's LEO satellites are dimmer than BlueBird but brighter than most Starlink satellites, which benefit from being in Earth's shadow.
But there's a catch. Future Amazon LEO satellites are planned to orbit at lower altitudes, making them even brighter. This raises concerns among astronomers, as John Barentine, a dark sky expert, notes that these satellites are particularly noticeable during twilight.
Amazon's internet constellation is still in its early stages, with only 180 satellites launched so far. However, the company aims to deploy over 3,200 spacecraft, potentially exacerbating the issue. But there's a silver lining—Amazon is collaborating with astronomers to mitigate the impact.
Mallama commends Amazon's efforts to reduce satellite brightness. They are exploring solutions like making the underside of the spacecraft mirror-like to reflect sunlight into space and orienting components to minimize visibility from the ground. And it's working—Amazon's engineers have already reduced the light reflected by their satellites since their first test launches.
The controversy surrounding satellite megaconstellations and astronomy isn't new. Astronomers raised concerns after SpaceX's Starlink launch in 2019, noticing streaked images due to satellite trails. However, SpaceX has also taken steps to reduce brightness.
A previous report by Mallama's team found that most internet-beaming constellations exceed IAU brightness limits, except for OneWeb satellites at higher altitudes. This suggests that the issue is widespread and requires industry-wide collaboration.
As we navigate the balance between technological progress and scientific discovery, the question arises: can we have both? How can we ensure that our quest for global connectivity doesn't obscure our view of the stars? The debate is open, and your thoughts are welcome in the comments.
