Researchers say an anomaly in the orbits of distant Kuiper Belt objects points to the existence of an unknown planet orbiting the sun.
Neptune, the other blue planet, is the eighth planet in our solar system. Neptune is an ice giant.
Witnessing an aurora first-hand is a truly awe-inspiring experience no matter what planet you may be on.
It's officially autumn, and time once again to seek out the two most distant planets of our solar system, Uranus and Neptune.
An illustrated Web comic by the cartoonist Boulet explains his passion for stargazing, and takes readers on an awe-inspiring tour of the cosmic landscapes made visible by science.
NASA began an early feasibility study for missions to the distant, mostly-ignored ice-giants Uranus and Neptune, a senior agency official said here Aug. 24.
From gorgeous views of Pluto and its largest moon Charon to an amazing shot of the International Space Station crossing the moon's face, don't miss these amazing space images.
Thanks to instruments on board NASA's New Horizon's spacecraft, which will fly by Pluto this summer, scientists are able to get an unprecedented look at the space weather near the dwarf planet.
Neptune's moon Triton has some unique properties among the moons of the solar system, which could make it an interesting location for a space colony.
Alan Stern, principal investigator of NASA's New Horizons mission to Pluto, talks to Space.com about the probe's July 14 flyby of the dwarf planet.
Observers with keen eyes will be able to see two little-spotted planets in the night sky this season.