A new formation theory for Pluto's moon Charon could explain why Pluto is geologically active. Illustration incorporates NASA New Horizons terrain imagery. Pluto — demoted to dwarf planets status in ...

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Astronomy has a way of defying labels. Just when researchers think they've drawn a clean line between two cosmic categories, nature tosses in something unexpected. Take stars and planets. A star is a ...

This story is part of Short Wave's series Space Camp about all the weird, wonderful things happening in the universe. Check out the rest of the series. If you were born in the last century you might ...

Our solar system is much like a trail of microcosmic breadcrumbs: Follow the molecular bits as far back as they go, and you'll learn a thing or two about where many of our planets and other celestial ...

Earth was long thought to be the only planet in our Solar System with an ocean, but it is beginning to look as though there are underground oceans inside even the most surprising icy bodies. In fact, ...

The galaxy’s most common stars rarely host sub-Neptune planets, revealing a new pattern in how close-in worlds form.

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory about the possibility of a giant ninth planet. The dwarf planet's existence ...

A nearby Earth-sized planet offers a rare chance to study how atmospheres survive or disappear on rocky worlds.