• The radius: of neptune is 15,299 miles (24,622 km)
  • The surface area: 2,94 billion sq miles (7.62 
billion km)

The diameter of Neptune is approximately 49,500 km. This makes Neptune the 4th largest planet in the Solar System. And compared to Earth? Neptune is 3.9 times bigger.

One day on Neptune takes about 16 hours (the time it takes for Neptune to rotate or spin once).

Neptune makes a complete orbit around the sun (a year in Neptunian time) in about 165 Earth years (60,190 Earth days).

Neptune is a sister ice giant to Uranus. Neptune is mostly made of a very thick, very hot combination of water (H2O), ammonia (NH3), and methane (CH4) over a possible heavier, approximately Earth-sized, solid core.

the temperature of Neptune’s interior is much hotter than its outside. The temperature of the core of Neptune is 7000 degrees Celsius, which is comparable to the surface of the Sun.Neptune is the most distant planet from the Sun, with temperatures that plunge down to 55 Kelvin, or -218 degrees Celsius.

Neptune has 13 moons,

I like this plant because it is a cold plant and it is named after Poseidon 

The only spacecraft that has ever visited Neptune was NASA's Voyager 2 spacecraft, which visited the planet during its Grand Tour of the Solar System. Voyager 2 made its Neptune flyby on August 25, 1989, passing within 3,000 km of the planet's north pole.

Voyager 2's observations confirmed that these unusual rings are not uniform but have four thick regions (clumps of dust) called arcs. 

Neptune was predicted by John Couch Adams and Urbain Le Verrier. The men independently accounted for the irregularities in the motion of Uranus by correctly predicting the orbital elements of a trans-Uranian planet. Using the predicted parameters of Le Verrier (Adams never published his predictions), Johann Galle discovered the planet in 1846. Galle wanted to name the planet for Le Verrier, but that was not acceptable to the international astronomical community. Instead, this planet is named for the Roman god of the sea.

I used www.jpl.nasa.gov

 and solarsystem.nasa.gov.
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Public - 9/27/16, 6:57 PM