The farthest planet from the sun, Neptune takes over 160 years to orbit the sun.
Neptune has the second-strongest gravity of any planet in the solar system. It is only outranked by Jupiter.
Like Uranus, Neptune is made of a mix of hydrogen, helium and methane.
Neptune's winds are the fastest in the solar system, reaching up to 1,340 miles per hour.
One of Neptune's most noteworthy features was its Great Dark Spot, a massive and fierce storm in the planet's southern hemisphere.
Neptune has a very faint ring system made of ice and dust particles.
Neptune has 14 moons, the most well-known and largest of which is Triton.
Triton has a very diverse, icy landscape consisting of craters, geysers and so-called 'cantaloupe terrain'.
Triton is the coldest place in the solar system, with a recorded low of just 38 degrees above absolute zero.
Triton is quite geologically active. Cryovolcanoes spew out ammonia and nitrogen gas from the surface. The plumes extend up to 5 miles above the surface. And thanks to this activity
constantly renewing the surface, Triton has relatively few impact craters.
Triton orbits Neptune opposite the planet's rotation.
In about 3.5 billion years, Triton is predicted to move so close to Neptune that the planet's massive gravity breaks it apart.