What powers Jupiter's Great Red Spot?

The answer

Jupiter's Great Red Spot is an anticyclonic storm approximately 1.3 times the diameter of Earth, with wind speeds reaching 680 km/h. It has persisted for at least 350 years (first reliably observed in 1831, possibly as early as 1665). The storm is powered by Jupiter's internal heat - the planet radiates almost twice the energy it receives from the Sun - and sustained by the planet's rapid 10-hour rotation, which creates powerful jet streams. The red color likely comes from complex organic molecules produced by sunlight breaking down ammonia and acetylene. Recent observations show the spot is slowly shrinking.