"Diamond rain" on the giant icy planets Neptune and Uranus could be more common than previously thought, say scientists.

Rocks on Mars that date back nearly 4 billion years are composed of large grains of olivine, which tints Hawaiian beaches green back on Earth.

A reconstruction of the early history of several asteroids indicates that the solar system at its beginnings was much more chaotic than we thought.

The first ever look at a baby gas giant in its earliest stages provides evidence for a long-debated alternative theory of how Jupiter-like planets form.

Researchers conclude that only certain types of planets can form moons that are large in respect to their host planets. It could narrow the search for life.

Force generated by the pull of the sun on the moon, rather than heat, may be responsible for the movement of the Earth's tectonic plates, researchers argue.

New results "suggest that Earth, like the other rocky planets Mercury and Mars, is cooling and becoming inactive much faster than expected."

"Eggshell planets" have an ultra-thin outer brittle layer and probably no plate tectonics. That raises questions about their habitability.

Inner planets were likely born from repeated hit-and-run collisions, a finding that challenges conventional models of planet formation.

"There is likely a threshold on the size requirements of rocky planets to retain enough water to enable habitability and plate tectonics..."