Scientists found proof that a giant early planet existed in the solar system 4.5 billion years ago.

A rare meteorite found in the Sahara Desert may be evidence of a long-lost "protoplanet" that formed in the early solar ...

Scientists may have identified one of the Solar System’s most important “planet factories” hidden just beyond Jupiter.

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The outer solar system once seemed like a quiet backwater. But a glut of tiny, strange moons with unruly orbits are coming ...