Jul 26 2011
Remind Me Again, Why Isn’t Pluto a Planet?
In light of the discovery of a fourth moon orbiting Pluto, Mark Thompson ponders what it takes to be called a "planet."
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Jul 20 2011
Hubble Discovers New Pluto Moon
Pluto may have been demoted to dwarf planet status, but it's queen bee to a clutch of moons that now number four.
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Apr 20 2011
Pluto’s Atmosphere: Big, Poisonous and Comet-like
The dwarf planet has shocked astronomers with its dynamic atmosphere -- previously undetected carbon monoxide has been discovered and it may even have a comet tail-like shape.
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Mar 18 2011
Pluto-Bound Probe Sprints Across Uranus’ Orbital Path
The fastest man-made object ever built crosses the orbit of Uranus today on its nearly decade-long odyssey to the dwarf planet Pluto.
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Mar 02 2011
Should the Cluttered Skies Demote Earth?
If you want to be a purist, the plethora of nearby asteroids suggests that Earth is just a dwarf planet, like its distant cousin Pluto.
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Feb 20 2011
A Universe Stranger Than We Can’t Imagine
Ever looked up at the night sky and wondered: What is up there?
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Dec 21 2010
Pluto May Host an Ocean
The dwarf planet's interior could contain a pool of liquid 120 miles beneath the surface.
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Nov 12 2010
Pluto Might be Bigger, But Eris is More Massive
During a rare occultation event, Eris was measured by telescopes in Chile and it turns out the dwarf planet behind Pluto's demotion may not be that big after all.
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Nov 10 2010
Wake Up, Sleeping Pluto Probe
More than halfway through its 10-year, 3-billion-mile journey to Pluto, NASA's New Horizons spacecraft is being roused from hibernation this week to relay tracking information back to Earth.
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Oct 07 2010
Eris and Pluto Find Common Ground
Eris appears to have similar quantities of nitrogen and methane ices locked in its surface as its smaller dwarf planet cousin.
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