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What Will Emerge from the Wreckage of the Arecibo Telescope?
In a corner of his laboratory, Professor Abel Méndez, director of the Planetary Habitability Laboratory at the University of Puerto Rico, keeps one of his most cherished mementos related to the Arecibo radio telescope. Simple sheets of paper hanging on the wall show the schedule where astronomers and scientists from all over the world were assigned blocks of two to four hours to use the telescope and listen to the universe. Méndez’s initials are still there: AM. For more than 50 years, Arecibo was the world’s largest single-dish telescope. And starting in 2017, Méndez made frequent visits to the Arecibo Observatory, about a 30-minute drive from the university, to focus on the stars. His goal? To explore the habitability of exoplanets. “There are stars that are very active, such as red dwarfs, and others like the sun, which you could say are rather quiet,” he says. “I used the radio telescope to observe which stars were the most stable because those are the ones that planets with a more habitable atmosphere are likely to be around,” he adds. In part, Arecibo helped him understand what to prioritize in his research. Until December 1, 2020, when the telescope collapsed. Luisa Fernanda Zambrano, a Colombian planetary scientist who had observed and classified asteroids with the Arecibo radio telescope since 2013, remembers that painful day: “I cried, my team cried, we were all crying,” she says from her office in the United States, where she works with the Florida Space Institute at the University of Central Florida.
Connecticut Public
How Can we Protect Satellites in Earth-moon Space? This New Software Could Help
As the space around Earth becomes increasingly cluttered with human-made junk, scientists are ramping up their efforts to safeguard satellites in real time. The latest in that effort are new algorithms being developed at the University of Central Florida (UCF) to automatically monitor and protect spacecraft from bumping into satellites and asteroids in cislunar space — the realm between Earth and the moon, which is under the gravitational influence of both celestial bodies. Because cislunar space is so vast, tracking and predicting the orbits of satellites, spent rocket stages and asteroids is a challenging task, scientists say. The existing infrastructure "is not equipped to provide the needed coverage in cislunar space," Tarek Elgohary, an associate professor of aerospace engineering, said in a UCF statement. "There is a need for fast and accurate solutions to quantify uncertainties to improve predictions and provide [space domain awareness] information in the absence of continuous coverage." The new algorithms are being designed to autonomously track objects and predict collisions in low Earth orbit (LEO), which is expected to become increasingly crowded in the coming decade. Elgohary said the same tools, whose development is largely being funded by the Virginia-based Air Force Office of Scientific Research, could also be used to monitor ships at sea, predict their paths and "spot suspicious behavior in real time."
Space.com