Interstellar Comet 3I/ATLAS Today: Latest Dec. 17, 2025 Updates Ahead of Its Dec. 19 Earth Flyby
Two days before it reaches its closest point to Earth, interstellar comet 3I/ATLAS is giving astronomers and serious backyard skywatchers a rare, time-limited opportunity: observe a visitor that formed around another star, then wandered into our solar system on a one-way trip