17 January 2011, 06:35 PM ET
A list of skywatching events in January 2011 that you don't want to miss.
20 December 2010, 10:00 AM ET
How to best observe the major planets of our Solar System. Some have worlds of their own.
29 November 2010, 07:13 AM ET
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.
15 November 2010, 04:28 PM ET
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.
29 September 2010, 07:38 AM ET
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.
23 September 2010, 12:51 PM ET
Planet Neptune shouldn't have so active an atmosphere. And its big moon Trtion seems a close cousin of Pluto and other dwarf planets of the Kuiper Belt. What's going on out there?
23 September 2010, 11:49 AM ET
See Neptune's moon Triton up close with new footage released from the 1989 flyby of the Voyager 2 probe.
13 September 2010, 03:01 PM ET
A cache of 14 large space rocks beyond Neptune was recently discovered by astronomers searching through the archives of the Hubble Space Telescope.
18 August 2010, 08:04 AM ET
On Aug. 20, Neptune will be in opposition, completing its first trip around the sun since its discovery in 1846. Seasoned skywatchers may be able to see Neptune during opposition as it completes its first orbit since its discovery.
12 August 2010, 02:12 PM ET
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."
23 July 2010, 02:48 PM ET
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.
16 June 2010, 01:02 PM ET
A small space rock that orbits the sun from out beyond Neptune is almost completely coated in water ice, according to a new study.
21 April 2010, 01:24 PM ET
A Neptune-sized planet orbiting another star has one odd atmosphere – analysis has shown that it lacks methane, a common ingredient for many planets in our solar system and a possible signature of life.
29 March 2010, 08:03 AM ET
Cloud feature over Neptune's south pole is seen splitting in two, suggesting it could be similar to Saturn's polar vortex.
28 September 2009, 08:55 AM ET
Water is all over the solar system and the rest of the galaxy. What's it mean to the search for life?
08 September 2009, 08:50 AM ET
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.
15 July 2009, 01:06 PM ET
Nice model of solar system evolution says migration of gas giants pushed asteroids into asteroid belt.
09 July 2009, 10:40 AM ET
It has long been known that Galileo observed Neptune, but it was thought that he discounted the object as a star.
08 July 2009, 01:33 PM ET
With some preparation, you can spot it anytime now through next week.
22 May 2009, 12:06 PM ET
Neptune is huge. But few have ever seen it. Here's your chance.
13 March 2009, 09:38 PM ET
Astronomers have discovered a planet somewhat larger and more massive than Neptune.
18 November 2008, 08:25 AM ET
The nitrogen and methane ice covering Eris could be the result of weather on the dwarf planet.
17 October 2008, 10:06 AM ET
A simulation shows how thunderstorms create jet streams on giant planets.
10 October 2008, 06:28 AM ET
Neptune is much too faint to be perceived without any optical aid.
18 August 2008, 11:01 AM ET
Astronomers have discovered a comet-like object lurking near Neptune's orbit.
31 July 2008, 06:41 AM ET
SETI invites scuba divers on an expedition to a destination of your choice.
10 July 2008, 06:34 AM ET
Could aliens be tuning into the most powerful radio transmitter on Earth?
31 December 2007, 07:00 AM ET
Our solar system may be home, but mysteries remain in its most distant corners.
18 December 2007, 06:05 AM ET
Swapping Neptune and Uranus could help explain solar system's formation.
02 November 2007, 07:11 AM ET
Neptune can be picked-up using just a good pair of binoculars.
18 September 2007, 01:17 PM ET
Neptune's warmer south pole responsible for methane hot spots.
19 July 2007, 11:59 AM ET
An extremely lopsided debris disk has been found with a thin needle shape.
30 January 2007, 06:01 AM ET
Neptune may be escorted in its orbit by thousands of asteroid-like objects, perhaps more than exist in the entire asteroid belt.
17 November 2006, 02:20 PM ET
15 June 2006, 02:05 PM ET
Three new rocky bodies have been detected in the same orbit as Neptune, bringing the total number of the gas giant's asteroid companions, or "Trojans," up to four.
17 May 2006, 01:00 PM ET
Three medium-sized planets of roughly the same mass as Neptune have been discovered around a nearby Sun-like star that contains an asteroid belt.