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Reaches 30,000°C. Sun"s surface is only 5,500°C. When lightning strikes, it turns air into plasma.
A lightning bolt can instantly reach 30,000°C. The Sun"s surface temperature is about 5,500°C - lightning is 5 times hotter.
This extreme heat instantly turns surrounding air into plasma. The air explosively expands and thunder is exactly this explosion sound.
Lightning lasts about a millionth of a second. In this brief moment, enough energy is released to power a light bulb for 3 months.
Source: National Weather Service