Bright satellites launched by AST SpaceMobile concern astronomers

In a groundbreaking development, AST SpaceMobile successfully launched five commercial satellites into low Earth orbit (LEO) on September 12, 2024, as part of its BlueBird 1-5 mission. These satellites, designed to offer global cellular broadband services directly to smartphones, have sparked concern within the astronomy community due to their unprecedented brightness.

Super bright satellites launched by AST SpaceMobile concern astronomers

The launch took place at 4:52 a.m. EDT from Cape Canaveral, Florida, marking a significant step in the development of AST SpaceMobile’s space-based communications network. The company, known for building the first and only space-based cellular broadband network, aims to provide seamless connectivity for commercial and government use through these satellites. However, the introduction of such large and reflective arrays into LEO has raised alarm among astronomers worldwide.

While AST SpaceMobile celebrates the success of the mission, astronomers warn of the unintended consequences these bright objects may have on scientific observation. These newly launched satellites are expected to be more visible than most stars, significantly impacting the night sky's natural visibility. One astronomer stated, "The arrival of more super-bright satellites could severely disrupt our ability to conduct critical astronomical observations, from studying distant galaxies to tracking near-Earth objects."

The worry stems from the reflection of sunlight off the large satellite arrays, which could rival the brightness of all but the most luminous celestial bodies. This echoes concerns voiced when AST SpaceMobile launched its prototype satellite, BlueWalker 3, in 2022. That satellite was criticized for being brighter than most stars, hindering astronomers’ ability to observe the night sky. Now, with five additional satellites in orbit, many fear that the growing number of such reflective objects will further impede scientific research.

AST SpaceMobile defends satellite launch, highlighting global connectivity benefits amid astronomers' concerns

In response to these concerns, AST SpaceMobile has emphasized the immense benefits of its space-based broadband network. The company’s new BlueBird satellites are equipped with advanced antenna arrays capable of delivering peak data transmission speeds of up to 120 Mbps and supporting approximately 5,600 coverage cells across the U.S. The network aims to provide non-continuous coverage across the country and other selected global markets, offering mobile connectivity in even the most remote locations.

Jeff McElfresh, Chief Operating Officer of AT&T, one of AST SpaceMobile's key partners, expressed optimism about the future of space-based telecommunications. "This is an exciting next step to a future where our customers will only be hard to reach if they choose to be—giving them the power to go anywhere and the possibility to do anything while staying connected with just an everyday cell phone," McElfresh said. He added that this advancement has been several years in the making, and the collaboration with AST SpaceMobile is helping to make space-based connectivity a reality.

Despite these benefits, astronomers continue to urge for solutions that balance technological innovation with the preservation of the night sky. Many are calling for stricter regulations on the brightness of satellites or for the implementation of designs that minimize light reflection. A representative from the International Astronomical Union (IAU) noted, "While we recognize the importance of expanding global connectivity, we must also protect our ability to study the universe and safeguard Earth from potential asteroid impacts."

AST SpaceMobile has acknowledged the feedback from the scientific community but remains focused on its mission to provide global connectivity. The company has secured significant strategic investments from major telecommunications players, including AT&T, Verizon, and Vodafone, as well as the U.S. government.

As the number of satellites in orbit continues to grow, the tension between technological progress and the preservation of the night sky remains a key issue. The next steps in addressing this challenge will likely require collaboration between satellite companies and the scientific community to ensure that space remains a resource for both innovation and discovery.

Read the AST SpaceMobile press release