In contrast tae the hazy, relatively featureless atmosphere o Uranus, Neptune's atmosphere is notable for its active an veesible wather patterns. For example, at the time o the 1989 Voyager 2 flyby, the planet's soothren hemisphere possessed a Great Dark Spot comparable tae the Great Red Spot on Jupiter. These wather patterns are driven bi the strangest sustained winds o ony planet in the Solar Seestem, wi recordit wind speeds as heich as 2,100 kilometres per hour (1,300 mph). Acause o its great distance frae the Sun, Neptune's ooter atmosphere is ane o the cauldest places in the Solar Seestem, wi temperaturs at its clood taps approachin 55 K (−218 °C). Temperaturs at the planet's centre are approximately 5,400 K (5,000 °C). Neptune haes a faunt an fragmented ring seestem (labeled 'arcs'), which mey hae been detectit durin the 1960s but wis anly indisputably confirmed in 1989 bi Voyager 2.