EVERYDAY SCIENCE

Detailed explanation-1: -Neptune has the longest period of revolution (164 years) around the sun.

Detailed explanation-2: -The period of revolution increases as the distance of the planet increases from the sun. So Neptune has the longest period of revolution.

Detailed explanation-3: -One day on Neptune takes about 16 hours (the time it takes for Neptune to rotate or spin once). And Neptune makes a complete orbit around the Sun (a year in Neptunian time) in about 165 Earth years (60, 190 Earth days).

Detailed explanation-4: -Neptune takes 165 years to make one orbit around the Sun and has 13 known satellites.

Detailed explanation-5: -More than 30 times as far from the Sun as Earth, Neptune is the only planet in our solar system not visible to the naked eye and the first predicted by mathematics before its discovery. In 2011 Neptune completed its first 165-year orbit since its discovery in 1846.