Neptune

Neptune is an armless planet, like Saturn, he is way too scared because he is freezing cold and is way too far away from the Sun, he orbits around the sun every 164 years, (longest lived person was Jeanne Calment and she never lived for 164 years and lived for 122 years)

he is too far to be seen with the human eye, and was the only planet who mathematicaly predicted his appearance, his largest moon is Triton and was discovered shortly after but the other 13 were not discovered until the 20th century.

his atmosphere is made out of hydrogen, helium, methane, ammonia, water, etc.

in 1989, Voyager 2 spotted a dark blue spot on his surface called the "Great Dark Spot"

Siblings or Moons

 * Naiad
 * Thalassa
 * Despina
 * Galatea
 * Larissa
 * Hippocamp
 * Proteus
 * Triton
 * Neried
 * Halimede
 * Sao
 * Laomedia
 * Psamathe
 * Neso

him in fiction
he has appeared in many works of fiction, examples include
 * in The Star, he is destroyed on a collision with somebody else
 * the majority of the movie "Event Horizon" takes place on his surface, a spaceship reappeared on it's decaying orbit around him after a 7-year long disappearance.

Trivia

 * when Pluto was discovered in 1930, he was the second farthest planet, but in 2006 thy reclassified Pluto as a "dwarf planet" which made her so mad that she wants revenge on him