The debate about an undiscovered planet X or planet 9 has been going on for more than 100 years.
Articles on Kuiper Belt
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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 dwarf planets in our Solar System are cold, dark, far away and full of surprises.
Megaconstellations of satellites will visually clutter the night sky, disrupting astronomical research. And the environmental damage caused by these satellites is still unknown.
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?
Meet Arrokoth – one of the first generation of solar system objects.
There’s a mysterious lack of small bodies beyond Neptune, but a ‘snowman-shaped’ object may help explain why.
It turns out that a common physical process called diffusion can explain the orbits of faraway minor planets – no need for a Planet Nine.
The search for new objects, including new planets, in our solar system has turned up some interesting finds. There have been a few failures over the years too.
A new planet in our solar system? Let’s get direct proof before we start naming it.
Is it a dwarf planet, an asteroid or a comet? All of the above? Well, with the latest results about Ceres, researchers aren’t entirely sure anymore.
Space scientists have a busy decade ahead with plans to visit Jupiter, Mars, Mercury and other interplanetary bodies all on the cards.
Top contributors
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Associate Professor, Astronomy, University of Regina
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Professor of Planetary and Space Sciences, The Open University
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Research Fellow/Reader in Planetary Physics, Lancaster University
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Associate Professor in Planetary Astronomy, University of Canterbury
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Associate Professor in Archaeology and Space Studies, Flinders University
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Kevin Orrman-Rossiter is a Friend of The Conversation.
Sterrenkenner, History & Philosophy of Science, The University of Melbourne
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Professor of Planetary Geosciences, The Open University
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Professor of Physics and Astronomy, USC Dornsife College of Letters, Arts and Sciences
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Full Professor of Physics, University of the Western Cape
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Astrophysicist/Cosmologist, Australian National University
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Ph.D. Student in Astronomy & Astrophysics, Penn State
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Teaching Professor of Astronomy & Astrophysics, Penn State
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Senior Lecturer in Physics, Nottingham Trent University
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Professor of Physics, Deputy Director (Solar System) at the Mullard Space Science Laboratory, UCL