Planetary scientist Alan Stern has been fighting for Pluto's planethood ever since the icy body was demoted to "dwarf planet" in 2006. He lays out the case for Pluto at SPACE.com.
Neptune, the other blue planet, is the eighth planet in our solar system. Neptune is an ice giant.
The planet Neptune, eighth planet from the Sun in Earth’s solar system, is the fourth largest planet in diameter and third largest in mass. Neptune was named after the Roman God of the seas.
Astronomers searching for planets beyond our solar system could increase their odds of success by scrutinizing the dusty disks ringing faraway stars, a new study suggests.
A cache of 14 large space rocks beyond Neptune was recently discovered by astronomers searching through the archives of the Hubble Space Telescope.
Astronomers have discovered a new asteroid in a region of Neptune's orbit where no previous object was known to exist – a so-called gravitational "dead zone."
New measurements of Neptune's atmosphere from a European space telescope suggest that a comet may have impacted the outer-most planet in our solar system approximately two centuries ago.
A small space rock that orbits the sun from out beyond Neptune is almost completely coated in water ice, according to a new study.
Cloud feature over Neptune's south pole is seen splitting in two, suggesting it could be similar to Saturn's polar vortex.
Water is all over the solar system and the rest of the galaxy. What's it mean to the search for life?
NASA released new pictures of Neptune’s freezing moon Triton, made from data taken by the Voyager 2 spacecraft on its way out of the solar system in 1989.
Nice model of solar system evolution says migration of gas giants pushed asteroids into asteroid belt.
It has long been known that Galileo observed Neptune, but it was thought that he discounted the object as a star.