The Great Red Spot
Neptune takes the longest
Everlasting cyclone in Saturn. Longest lasting and one of the largest cyclone in the solar system.
Neptune.
Jupiter is the largest with the largest diameter.
Olympus Mons is the largest volcano in our solar system. Valles Marineris is the longest, deepest canyon in our solar system. Both of these are on Mars.
The longest river in the solar system is thought to be the Vid Flumina on Saturn's moon Titan. It is around 400 km (250 miles) long and it flows into the liquid methane and ethane seas on Titan's surface.
Neptune, at about 165 Earth years.
Jupiter takes 11.86 Earth years to orbit the Sun - this is the 4th longest orbital period.
(The year is proportional to the distance to the power 1.5) In our solar system, Mercury has the shortest year. Neptune has the longest.
The longest solar eclipse is about 7 minutes 40 seconds.
Uranus has the longest day of any planet in the solar system, with a rotation period of about 17 hours and 14 minutes.
The longest word in the solar system is "methionylthreonylthreonylglutaminylarginyl isoleucine," which is the chemical name for titin, the largest known protein. Titin is found in muscle tissues and is responsible for muscle contraction and elasticity. Its chemical name consists of 189,819 letters and can take over three hours to pronounce in its entirety.