A New Satellite Outshines Some of the Brightest Stars in the Sky

Becky Ferreira writes via the New York Times: Last November, a satellite in low-Earth orbit unfurled into an expansive array that extends across nearly 700 square feet, about the size of a studio apartment. The satellite, BlueWalker 3, has since become one of the brightest objects in the sky, outshining some of the most radiant stars in the Milky Way, according to a study published on Monday in Nature -- and it is just the first of dozens of similar satellites that are in development by AST SpaceMobile, a company that aims to keep smartphones connected from orbit. "The issue is not necessarily that one satellite," said Siegfried Eggl, an astrophysicist at the University of Illinois, Urbana-Champaign and an author of the new study, "but that it is a predecessor or prototype of a constellation, so there's going to be a lot of those out there eventually." Initially launched in September 2022, BlueWalker 3 is the forerunner of AST SpaceMobile's BlueBird satellites, which aim to serve as a network of orbital cell towers with the goal "to democratize access to knowledge and information regardless of where people live and work," a spokesperson for AST SpaceMobile said. Last month, BlueWalker 3 successfully relayed its first 5G connection to a smartphone in a cellular coverage gap on Earth. AST SpaceMobile is one of many companies racing to capture the surging demand for global broadband connectivity. "At the moment, there are 18 constellations that we know are planned all over the world," Dr. Eggl said. "The total number of satellites is a stunning half a million that people are planning to put up there. This is 100 times more than we already have." AST SpaceMobile made BlueWalker 3's array so large in order to beam strong cellular coverage directly to phones on Earth. The satellite is made of many small antennas that can connect existing smartphones, which is an approach that distinguishes the company from Starlink and other planned constellations that currently rely on ground antennas or dishes. [...] AST SpaceMobile said that it was working with astronomers on techniques to reduce disruptions. It also contrasted the number in its constellation with the tens of thousands planned by other companies. The spokesperson said it could "provide substantial global coverage with around 90 satellites." Though BlueBird satellites would be far fewer in number, they are at least 64 times as big and bright as a Starlink satellite. The SpaceX orbiters are also brightest in the days after their deployment, but they become much fainter once they settle into their target orbits. Astronomers expect that the BlueBird satellites will remain bright in the sky throughout most of their lifetime. As a consequence, one of these satellites could interfere with data captured by astronomical observatories.

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