This survey of the planets includes all the basics, size, mass, atmosphere, length of day, and the like. It features interactive activities and learning exercises and compares all of the planets in colorful tables.

Kids learn about the ice giant planet Neptune of the Solar System including fun facts, mass, day, year, and distance from the Sun. Astronomy for kids and teachers.

A basic overview of the planet Neptune. Links to information about the other planets and objects in our solar system are included.

A good general introduction to planet Neptune for students. Has many links to more detailed information about the planet throughout the page, as well as special links for interesting facts. Also features a printable version of the page.

A detailed overview of the history, mythology, and current scientific knowledge of each of the planets and moons in the solar system.

A wealth of facts await you on this complete site. Topics include size, mass and gravity, length of day, orbit, distance from the sun, and more. A coloring page, quiz, fill-in-the-blanks activity, and interactive puzzle will challenge...

Enter our solar system to interact with the planets, moons, asteroids, meteors, and more. Investigate with NASA scientists and explore missions related to space exploration. Read facts, compare statistics, look through resources, and...

Discover interesting facts about Neptune, the fourth-largest planet.