Neptune, the other blue planet, is the eighth planet in our solar system. Neptune is an ice giant.
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.
Jupiter's Great Red Spot — the most powerful storm in the solar system — is at its smallest observed size yet, and scientists aren't sure why.
Voyager 2, arriving at Jupiter four months after Voyager 1, was actually launched 16 days before its mate.
In the star cluster NGC 6811, astronomers have found two planets smaller than Neptune orbiting Sun-like stars, as seen in this space wallpaper.