Neptune is the eighth planet from the star Sol at a distance of 30.07 A.U.. It is 30,783 miles in diameter. Its day equals 0.73 Earth days and its year equals 164.79 Earth years. The temperature at Neptune's cloud tops is -300 (F and its gravity is 1.12 that of Earth. Neptune is a gas and ice-rich planet much like Uranus and also has a ring-system and a number of moons. The Neptune colonies were established on Neptune's larger moons.
Before America's entry into WWII, a space ship from Neptune crashed on Earth, and the giant people aboard were killed. Hawkman found the wreckage, and salvaged an egg, which he took home and hid. His fiancee found the egg and gave it to Noel Ratchford, a scientist. The egg hatched, producing a Neptunian boy, and Ratchford trained him for a career of evil. He grew into a giant, and could emit deadly beams from his eyes. Ultimately Hawkman fought the giant boy, to the death.
Early in WWII, German scientist Gootsden managed to strand eight members of the Justice Society on eight different planets, in an alternate dimension. Dr. Mid-Nite arrived on an alternate-dimension version of Neptune, which was inhabited. Using his medical science, he was able to cure several harmful diseases. The grateful Neptunians rewarded Mid-Nite with a set of books containing advanced knowledge. Soon afterward, he returned to Earth. It was later revealed that Dr. Mid-Nite had actually traveled to the Neptune of another dimension, in Hyperspace, not the native Neptune of the Earth-Two dimension.
Some time in the first half of the 20th Century, a piece of the all-male planet Neptune broke off, flew across the Solar System, and landed on Earth, forming an undersea city in the Pacific Ocean, called Neptunia.
Neptune of the 853rd Century will be terraformed to become an ocean planet capable of supporting life, mainly aquatic creatures. The planet will be patrolled by Aquaman, and be a place where entire cities of living coral gently ride the ocean currents, where aquatic life from all corners of the cosmos schools in harmony. Available here will be the finest accommodations and most exotic resorts. Neptune will be among the most popular vacation destinations in the quadrant.
- In Earth-Two continuity, Neptune is orbited the former planet Femina, now relocated and owned by the Neptunians.