Could a celestial traveller visiting our solar system be artificial? That startling possibility has been raised by Harvard's controversial astrophysicist, Avi Loeb. The object in question, 3I/ATLAS, appears to be a comet but may defy expectations.
Loeb's provocative hypothesis is simple, if the object fails to show a detectable gas cloud, it challenges a natural explanation. If the standard comet 'tail' is missing, he argues, the scientific community must confront the idea that we might be observing alien technology.
