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Latest Discoveries About Pluto, the Dwarf Planet
Pluto, originally considered the ninth planet, was recently classified as a dwarf planet and is the least massive planet in the solar system.
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Photos of Pluto and Its Moons
July 11th, 2013
See images and illustrations of the dwarf planet Pluto and its three — now FIVE! — moons.
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Lowell Observatory: Where Pluto Was Discovered
April 26th, 2013
Lowell Observatory is best known for the discovery of Pluto. Astronomers there have also studied Halley's Comet and discovered an exoplanet in 2007.
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Celebrated Keck Telescopes Seek Funding on 20th Anniversary
March 15th, 2013
The Keck Observatory will be looking for more donations to counteract a freeze on federal grant spending.
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Clyde Tombaugh: Astronomer Who Discovered Pluto
February 15th, 2013
Kansas farm boy Clyde Tombaugh looked to the stars and found a new planet.
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Pluto Atmosphere Larger Than Thought, Study Shows
November 26th, 2012
The haze around Pluto can extend halfway to its moon Charon.
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Dwarf Planet Makemake: Icy Wonder (Gallery)
November 21st, 2012
See photos and illustrations of the distant icy dwarf planet Makemake.
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Vote Now! Top Space Stories of the Week - July 22, 2012
July 22nd, 2012
What was your favorite space news story of the last week? Vote Now!
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Should Pluto's 5th Moon Make It a Planet?
July 11th, 2012
Dwarf planets can have moons, too.
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Pluto's Moons | Five Satellites of Pluto
July 11th, 2012
Using the Hubble Space Telescope, astronomers have discovered a fifth moon orbiting the dwarf planet.
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Destination Pluto: NASA's New Horizons Mission in Pictures
July 11th, 2012
See photos from NASA's New Horizons mission to explore the dwarf planet Pluto.
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Pluto: A Dwarf Planet Oddity (Infographic)
July 11th, 2012
Learn all about Pluto's weirdly eccentric orbit, four moons and more in this SPACE.com infographic.
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Petitioners Push for Pluto Probe Postage Stamp
February 1st, 2012
The petition hopes to collect 100,000 signatures by March 13.
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'Star Trek' on Pluto? It Could Really Happen, Scientists Say
July 3rd, 2013
Some Pluto surface features may end up bearing the names of Captain Kirk and Mr. Spock.
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Tiny Pluto Moons Should Be Named Vulcan and Cerberus, Discoverers Say
April 24th, 2013
The names still have to be accepted by the International Astronomical Union.
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Pluto May Have 10 More Undiscovered Moons, Study Suggests
March 13th, 2013
One to 10 tiny, undiscovered moons could be circling Pluto, according to a new simulation.
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Your Help Wanted to Name Two of Pluto's Moons
February 11th, 2013
Vote online to name two of Pluto's moons.
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Dwarf Planet Beyond Pluto Lacks Atmosphere
November 21st, 2012
The dwarf planet Makemake is not quite the twin of Pluto once thought.
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Dwarf Planet Makemake Has No Atmosphere | Video
November 20th, 2012
The Dwarf Planet pass in front of a distant star (occulation) was witnessed from several locations in South America. Data from, European observatories in Chile shows it is not like Pluto as previously thought due to a lack of atmosphere.
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Vote Now! Top Space Stories of the Week - July 15, 2012
July 14th, 2012
What was your favorite space news story of the last week? Vote Now!
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Pluto's New Moon: Five Fun Facts
July 11th, 2012
The basics about Pluto's newly discovered satellite.
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Pluto, the Ninth Planet That Was a Dwarf
July 11th, 2012
The Solar System’s Runt
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Poll: Should Pluto Be a Dwarf Planet or Full-Fledged World?
July 11th, 2012
Should Pluto be classified as a dwarf planet or a full-fledged world?
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Plutonium Production May Avert Spacecraft Fuel Shortage
April 6th, 2012
A looming shortage of the radioactive isotope worries many planetary scientists.
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NASA Spacecraft in Home Stretch of Journey to Pluto
January 19th, 2012
New Horizons is zooming toward a close encounter with Pluto in 2015.
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2 Pluto Moons Get New Names (Sorry 'Star Trek' Fans)
July 2nd, 2013
Pluto's two smallest moons are now named Kerberos and Styx.
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Solar System Explored: Today's Deep-Space Spacecraft (Gallery)
March 19th, 2013
A look at the robotic spacecraft currently sending data home from beyond Earth orbit.
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Artist’s Impression of Dwarf Planet Makemake Space Wallpaper
February 27th, 2013
This space wallpaper shows an artist’s impression of the surface of the distant dwarf planet Makemake.
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Meet the Spacecraft Exploring the Solar System
January 3rd, 2013
A brief rundown of the intrepid spacecraft currently sending data home from beyond Earth orbit.
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Dwarf Planets of Our Solar System (Infographic)
November 21st, 2012
Pluto was demoted to dwarf planet status in 2006, joining Eris, Haumea, Makemake and Ceres. All the dwarf planets are tinier than Earth's moon.
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New Horizons: En Route to Pluto
November 7th, 2012
The New Horizons spacecraft is expected to reach the dwarf planet Pluto in 2015
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New Pluto Moon Hints at Perilous Journey for Spacecraft
July 12th, 2012
The New Horizons probe will have to watch its step when it flies by Pluto in 2015.
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Pluto's 5 Moons Explained: How They Measure Up (Infographic)
July 11th, 2012
Dwarf planet Pluto has one giant moon, Charon, but now is known to have four more tiny satellites.
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Pluto Quiz: How Well Do You Know the Dwarf Planet?
July 11th, 2012
See how much you know about the dwarf planet Pluto and its natural satellites.
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Pluto Has a Fifth Moon, Hubble Telescope Reveals
July 11th, 2012
The Hubble Space Telescope has found another moon orbiting Pluto, bringing its total to five moons.
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Pluto Stamp Watch: Stamp Petition Gains More Than 10,000 Signatures
February 22nd, 2012
NASA's New Horizons Pluto mission team is hoping for 100,000 signatures by March 13.
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Surface of Pluto May Contain Organic Molecules
December 21st, 2011
NASA's Hubble Space Telescope made the find.
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