The debate about an undiscovered planet X or planet 9 has been going on for more than 100 years.
Articles on Pluto
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The biggest planets hogged a lot of the raw materials and were fully formed first.
The discovery can also give clues not only about Charon, but other objects out near Pluto.
A South African team had a rare chance to capture information about Pluto’s atmosphere.
The Solar System could be awash with oceans, not on the surface but hidden inside the most surprising bodies
Jupiter’s moon Io has more than 400 active volcanoes on its surface.
A curious kid asks: Why does it matter if Pluto is a planet or a dwarf planet?
The dwarf planets in our Solar System are cold, dark, far away and full of surprises.
Pluto has recently active icy volcanoes, that have erupted water ice.
From the tallest cliff in the solar system to its largest impact basin, geological processes on other worlds are very similar to those on our own planet.
Pluto began hot inside, study of its surface fractures suggests
In the search for the hypothetical Planet Nine, scientists may have uncovered another explanation for the patterns in the orbits of Kuiper Belt objects.
A young reader asks: Is Pluto a planet?
Many people are still upset that Pluto was demoted from being a planet. But definitions of various celestial objects are fairly fluid. So whether it is an asteroid or moon or planet is up for debate.
The dwarf planet Pluto is heading away from the Sun and that’s having a devastating impact on its atmosphere.
There’s a mysterious lack of small bodies beyond Neptune, but a ‘snowman-shaped’ object may help explain why.
Senegal has made great strides in astronomy and planetary sciences in recent years.
Pluto has a density between that of rock and ice – so that immediately suggests the dwarf planet is made of a mix of both. But how do we know?
Images from New Horizons spacecraft provide more evidence about the surface of Pluto.
A group of astronomers are trying to reclassify Pluto as full ‘planet’. But there are good reasons to leave our classification system alone, and this doesn’t mean Pluto is any less interesting.
Top contributors
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Professor of Planetary Geosciences, The Open University
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Professor of Planetary and Space Sciences, The Open University
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Professor (Astrophysics), University of Southern Queensland
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Associate Professor, Astronomy, University of Regina
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Research Fellow/Reader in Planetary Physics, Lancaster University
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Associate Professor in Archaeology and Space Studies, Flinders University
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Senior Curator (Astronomy), Museums Victoria Research Institute; The University of Melbourne
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Research Scholar, Academia Sinica
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Teaching Professor of Astronomy & Astrophysics, Penn State
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Pro Vice-Chancellor Flagship Initiatives, Swinburne University of Technology
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Senior Instrument Scientist, Australian Nuclear Science and Technology Organisation
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Professor of Planetary Science and Astronomy, George Mason University
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Professor of Physics & Astronomy, University of California, Irvine
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Associate Professor in Astronomy, Monash University
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Professor Emeritus of Organizational Behavior, University of Virginia