Just as mysterious interstellar object 3I/ATLAS reemerged from behind the Sun last week, astronomers detected intriguing radio signals from it that give new clues about its chemical composition. 3I/ATLAS, which is widely believed to be a comet, has been soaring through the solar system at a breakneck speed, reaching its perihelion, or closest point to the Sun, on October 29. Days earlier, it reached its solar conjunction relative to Earth, or when the Sun was perfectly in line between us and the mysterious object, temporarily blocking it from view. Fortunately, there will be even more opportunities to study 3I/ATLAS before it leaves the solar system for good. “At that time, [NASA’s] Juno spacecraft will use its dipole antenna to search for a radio signal from 3I/ATLAS at low frequencies ranging from 50 hertz to 40 megahertz.”More on 3I/ATLAS: NASA Withholding New Images of Mysterious Object From Beyond Solar System