Cause: An unknown interstellar debris passed by the Earth. Its powerful magnetic field and energy instantly paralyzed all electronic equipment in the world (similar to a super EMP) and permanently changed the composition of the atmosphere, causing the global temperature to plummet at a rate of 5-10°C per day.
· Phenomenon: Power, communications, and networks are all interrupted, and modern civilization collapses overnight. The sky is always covered with gray-white clouds and the sunlight is weak. Heavy snow covered all cities north of 30 degrees north latitude, and the ocean began to freeze. This is not an instant destruction, but a slow and desperate process of "suffocation".
