Astronomers say this rare interstellar visitor could reveal secrets about worlds far beyond our own.

Every so often, our solar system gets a rare visitor from the stars beyond—and astronomers have just spotted one. Comet 3I/ATLAS is only the third known interstellar object ever detected passing through our cosmic neighborhood. What makes this icy traveler even more remarkable is what NASA’s James Webb Space Telescope has uncovered: its glowing coma is rich in carbon dioxide. That discovery offers scientists a rare chance to peek into the chemistry of worlds that formed far outside our own solar system.








