Japan’s XRISM mission reported a faint X-ray halo around interstellar comet 3I/ATLAS in November 2025, highlighting interactions with the solar wind. Comet 3I/ATLAS, discovered by a NASA telescope in Chile after entering the solar system in July 2025, drew coordinated observations from XRISM, XMM-Newton, and NASA’s NuSTAR. XRISM detected emission extending about 248,550 miles from the nucleus, described by the team as not explainable by imaging performance and consistent with charge-exchange X-rays. Scientists reported no collision risk; the December approach remains 167.77 million miles from Earth, 1.8 times Earth’s distance from the Sun. The discovery triggered a global shift to high-energy and radio observations before the December approach. Researchers also reported detections of elements that form organic molecules essential for life.