Pluto's not a planet – it's much odder than that
18 July 2012
The discovery of Pluto's fifth moon puts the distant world into a category all of its own
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Premium
Found 393 results for dwarf planet
Discovery of fifth moon reignites Pluto planet debate
12 July 2012
The icy rock now boasts more moons than the inner planets combined but is this enough for it to regain its planetary status?
Smallest exoplanet is the size of Mars
11 January 2012
The latest record-breaking exoworld is just 57 per cent as wide as Earth – its discovery around a common type of star suggests habitable planets abound
Dark matter mysteries: a true game of shadows
4 January 2012
Far from shedding light on dark matter, our first experimental glimpses of the elusive stuff have only deepened its mystique, says Stuart Clark
Astrophile: Supercritical water world does somersaults
18 November 2011
The planet 55 Cancri e is the most watery world found yet, but its great ocean is a strange hybrid of liquid and gas
Astrophile: Undead stars rise again as supernovae
28 October 2011
If a tribe of dormant, winking stars really are on the verge of going supernova, they will help reveal dark energy's true nature
Chile's high oasis of huge telescopes
12 October 2011
A mountain in a Chilean desert boasts some of the best telescopes on Earth – but visiting them is not for faint-hearted stargazers
Astrophile: Star exploded? Just another day in Arp 220
7 October 2011
If our galaxy was a couple of kids with sparklers, Arp 220 would be the most eye-popping fireworks display you've ever seen
Astrophile: The most surreal sunset in the universe
15 September 2011
Reminiscent of Tatooine in Star Wars, a planet has been discovered in orbit around two stars
Pluto's icy exterior may conceal an ocean
14 September 2011
If the dwarf planet's core has as much radioactive potassium as scientists think, it may have a subsurface ocean and the conditions to sustain life
