How Fast Is Neptune's Winds?

Neptune's winds reach 600 m/s — the strongest in the entire solar system. They are physically inexplicable; Neptune receives just 0.1% of the sunlight Earth gets, with no obvious energy source for these winds. The mystery has stood since Voyager 2 first measured them in 1989.

Neptune's winds reach Mach 1.5 in its frigid atmosphere — meaning local sound speed is exceeded by the planet's own weather.

• Mach 6
• Strongest winds in the solar system