Neptune

Liquid water could slosh beneath the frigid moon's icy shell.

Voyager 1's rocket only had 3.5 seconds of fuel left when it sent the probe on its way 35 years ago.

See sky maps to help spot the skywatching events of August 2012.

The two exoplanets come within five Earth-moon distances of each other.

Don't miss the seven major planets of the solar system in the night sky this week.

Astronomers have finally pinned just how long it takes for sunrise on Neptune.

The photos show the ice giants blazing red-orange in infrared light.

The Hubble telescope photos show the most clouds on Neptune seen in years.

Skywatching tips for how you can view six planets aligned above the rising sun.

Here's a look at how to observe the planets of the solar system in 2011.

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.

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.