Comet 3I/ATLAS, a rare interstellar visitor, is gearing up for its closest pass by Earth on December 19, 2025. Even though it will still be far out on the opposite side of the sun, its arrival has sparked excitement among scientists and skywatchers around the world. This comet has been behaving strangely enough to raise eyebrows, yet predictably enough for experts to confirm that we’re witnessing a natural phenomenon, not an alien detour. Here’s everything you need to know before the cosmic show unfolds.
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