In terms of total energy radiated, the prize goes to Hawaii's Kilauea (shown above), which has been spilling lava continuously throughout the study period.
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Lava is indeed very hot, reaching temperatures of 2,200° F or more. But even lava can't hold a candle to the sun! At its surface (called the photosphere), the sun's temperature is a whopping 10,000° F! That's about five times hotter than the hottest lava on Earth.