21 June 2012, 02:01 PM ET
The two exoplanets come within five Earth-moon distances of each other.
21 December 2011, 02:00 PM ET
Don't miss the seven major planets of the solar system in the night sky this week.
10 November 2011, 04:34 PM ET
Computer simulations show that a quick change in Jupiter's orbit caused a chain reaction and forever changed the orbits of the giant planets in our solar system, perhaps throwing a sister into the cosmic void.
09 October 2011, 07:00 AM ET
Astronomers have finally pinned just how long it takes for sunrise on Neptune.
07 October 2011, 03:37 PM ET
Astronomers used over 500 images from the Hubble Space Telescope and the Voyager probe to determine that 15hr:57min:59sec calls it a day on the "blue planet". This animation of images shows Neptune in its full rotational glory (time-lapsed).
26 September 2011, 04:32 PM ET
The photos show the ice giants blazing red-orange in infrared light.
07 August 2011, 08:08 AM ET
This week we saw debris from space shuttle Columbia found after eight years, launched a five-year mission to Jupiter and discovered potential dwarf planets.
14 July 2011, 10:04 AM ET
Over a century and a half of Earthly events have transpired during one Neptune orbit around the sun. Watch where Neptune was located during some of humanity's most important events since 1846.
12 July 2011, 03:50 PM ET
The Hubble telescope photos show the most clouds on Neptune seen in years.
04 May 2011, 04:10 PM ET
In late May and early June, the Moon will appear to dance from day to day with Jupiter, Mercury and Venus. This animation looks East at 5:00am from the U.S. East Coast. Viewers with telescopes can also spot Uranus, Neptune and Ceres in this ballet.
28 April 2011, 02:46 PM ET
Skywatching tips for how you can view six planets aligned above the rising sun.
01 April 2011, 05:33 PM ET
Here's a look at how to observe the planets of the solar system in 2011.
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.