Interstellar Comet 3I/ATLAS Mystery: NASA’s discovery of the comet 3I/ATLAS has sparked a frenzy among scientists, with Harvard astrophysicist Avi Loeb suggesting it might not be a natural object at all. From its unusual chemical composition to its enigmatic trajectory, here are seven clues that suggest a possible alien origin. Interstellar Comet 3I/ATLAS Mystery: NASA’s discovery of the comet 3I/ATLAS has sparked a frenzy among scientists, with Harvard astrophysicist Avi Loeb suggesting it might not be a natural object at all. From its unusual chemical composition to its enigmatic trajectory, here are seven clues that suggest a possible alien origin.