An extraordinary piece of cosmological history just zoomed through our backyard, and astronomers used the world’s premier space observatory to read its chemical diary.
According to a groundbreaking study published today in Nature, researchers turned NASA’s James Webb Space Telescope toward 3I/ATLAS—the third confirmed interstellar object ever detected—as it began its departure from the Sun in December 2025. What they found doesn't just rewrite our understanding of alien planetary systems; it takes us on a time-traveling journey back to the universe's "cosmic noon."
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