NASA's Juno Probe Reveals Extreme Heat Beneath Io's Volcanic Surface

For nearly half a century, Io has stood as the solar system's most volcanically tortured world — a moon so extreme it once strained the credulity of the scientists who first glimpsed it. Now, NASA's Juno spacecraft has done what no probe has done before: looked beneath that scorched surface using microwave imaging to measure the internal heat generated by Jupiter's relentless gravitational grip. In mapping the mechanics of tidal heating with new precision, Juno is not merely revealing one moon's interior — it is offering humanity a window into how gravity itself can kindle fire in distant, sun