Comet 3I/ATLAS Today (Dec. 25, 2025): What’s New After the Flyby, What NASA and ESA Just Saw, and Why It Matters
December 25, 2025 marks the strange, quiet “afterglow” phase of Comet 3I/ATLAS—the third confirmed interstellar object ever found passing through our solar system. The comet’s closest approach to Earth is already behind us (it passed at a safe distance), but the science story is still unfolding fast: Breakthrough Listen has now reported results from an ultra-sensitive “are you broadcasting?” radio search, while NASA and ESA continue to publish spacecraft observations that help pin down what this visitor is actually made of—and how it behaves when the Sun starts cooking it. SETI Institute The quick recap: what is 3I/ATLAS, and why