If core hydrogen fusion stopped today, what immediate effect impacts Earth?
Answer
A rapid cooling of the visible surface, plunging Earth into an instant, deep freeze
The energy sustaining life on Earth comes directly from the constant nuclear fusion occurring in the Sun's core. If this primary energy source were to vanish instantaneously, the radiant energy input would cease. This cessation would lead to the immediate, rapid cooling of the Sun's visible surface. Consequently, the Earth would experience an abrupt plunge into extreme cold, as the constant stream of thermal energy necessary to maintain terrestrial temperatures would stop flowing.
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