How Hot Is Saturn?
QUICK ANSWER
Saturn's cloud tops average about -288°F (-178°C), making the visible atmosphere extremely cold. The planet's interior gets dramatically hotter with depth, with the core estimated at around 21,000°F (11,700°C). Like Jupiter, Saturn generates significant heat internally, radiating more energy than it receives from the Sun.
Saturn is freezing at the cloud tops and scorching at the core, with a temperature gradient that spans tens of thousands of degrees. Like Jupiter, Saturn produces its own heat from gravitational compression, which drives weather patterns even out at its remote distance from the Sun.
How cold is Saturn at the cloud tops?
Brutally cold. According to NASA, Saturn's cloud-top temperature averages about -288°F (-178°C), even colder than Jupiter's cloud tops despite Saturn being a similar type of planet. The colder surface temperature is mostly because Saturn is farther from the Sun and receives much less solar heating. There's no solid surface at this level, just gas that gets colder the higher in the atmosphere you go, with the ammonia clouds and the haze layer above them being the coldest visible parts.
How hot is Saturn's core?
Around 21,000°F (11,700°C). The intense heat comes from a combination of leftover energy from Saturn's formation and ongoing gravitational compression. As Saturn's massive outer layers slowly settle inward over billions of years, that motion converts to heat at the core, keeping it extremely hot. Saturn's core is cooler than Jupiter's (which is about 43,000°F) because Saturn is less massive and therefore generates less compressional heat. But it's still hotter than the surface of any star smaller than a red dwarf.
Does Saturn make its own heat?
Yes, and more than you'd expect. Like Jupiter, Saturn radiates significantly more energy than it receives from the Sun, about 2.5 times more in Saturn's case. Some of this comes from the slow gravitational contraction of the planet, but Saturn also generates heat through a process called helium rain: helium droplets condense in the upper atmosphere and fall toward the core, releasing potential energy as heat. This mechanism is part of why Saturn's interior stays so hot despite the planet's distance from the Sun.
What's the weather like on Saturn?
Wild, despite the cold. Saturn has powerful winds (the equatorial jet stream can exceed 1,100 mph, much faster than Jupiter's), massive storms, and lightning. Roughly every 30 years, Saturn produces a Great White Spot, a massive ammonia ice storm that can encircle the planet. Saturn also has a famous hexagonal weather pattern at its north pole, a six-sided jet stream pattern unlike anything seen on other planets. The internal heat from Saturn's interior helps drive much of this activity, regardless of how distant the Sun is.
Saturn is bitterly cold at its cloud tops, around -288°F, but reaches 21,000°F deep inside. The planet generates more heat than it receives from the Sun, driven by gravitational compression and helium rain. Despite being far from the Sun, Saturn has some of the most active weather in the solar system, including the only known hexagonal storm pattern on any planet.
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