Interstellar Comet 3I/ATLAS Is Erupting, Pulsing and Powering Planetary‑Defense Drills Ahead of Its December 19 Flyby
Interstellar comet 3I/ATLAS – also known as C/2025 N1 (ATLAS) – has gone from obscure discovery to the most talked‑about object in the Solar System in just a few months. As of December 2, 2025, astronomers are reporting: All of this is happening while NASA, ESA and observatories worldwide repeat the same core message: 3I/ATLAS is a natural comet from another star system, and it poses no threat to Earth. NASA Science+1 Below is a deep, news‑style rundown of what we actually know today – and what remains a mystery. 1. Quick facts: What is comet 3I/ATLAS? 3I/ATLAS is only the third confirmed interstellar object ever seen passing through