Arrokoth, the furthest object a spacecraft has ever visited, could shed light on how planetary "building blocks" called planetisimals form.

The Earth's early magnetic field was stronger than scientists had believed, according to ancient crystals that give researchers a view into the past.

Thanks to NASA's TESS spacecraft, scientists have discovered two amazing new worlds: A potentially habitable exoplanet and one with two suns.

"...there could be anywhere from a few hundred to hundreds of thousands of these alien comets orbiting the sun."

Why there are so few exoplanets larger than Neptune has puzzled scientists, but new research offers a possible answer.

"It's sort of a bizarre thing to think about. You have crystals within the outer core snowing down onto the inner core..."

Could icy Hoth really exist? How about the iconic double suns of Tatooine? Experts on planetary formation, processes, and habitability discuss the science of Star Wars.

Volcanic activity on Mercury, or a lack of it, could help us find other Earth-like planets, researchers say.

The Earth is partly made of stardust from red giant stars, aging stars that expand because they've run out of fuel in their core.

How aggregates of space dust stick together and form planets has been a mystery, but researchers may finally have an answer.