Comet 3I/ATLAS Update (Dec. 12, 2025): First X‑Ray View, Green Glow, and How to Spot the Interstellar Visitor
ESA released X-ray images of interstellar comet 3I/ATLAS, showing it glowing in low-energy X-rays as it approaches its closest point to Earth on December 19. Gemini North telescope images reveal the comet’s coma now appears greener, likely from vented gases. The comet remains far from Earth and poses no threat.