Case Intel: The two Voyager probes, launched by NASA in 1977, crossed the heliopause — the outer boundary of the Sun’s influence known as the heliosphere — and discovered a blisteringly hot zone where plasma temperatures soared to approximately 30,000–50,000 kelvin (roughly 54,000–90,000 °F). In 2025, astronomers identified 3I/ATLAS, only the third interstellar object ever Discovery of interstellar object 3I/ATLAS revives Voyager’s heliopause ‘wall of fire’ record and draws fresh links to the mysterious Wow! Signal.