Our Solar System has eight planets, a few dwarf planets and more than 200 moons. But wait. Are you seeing double? Or did ...

The solar system — the gravitational system composed of the sun and everything that orbits it — is like our local ...

Known as the giant-impact hypothesis, this proposed event involves a collision between Earth and a hypothetical Mars-sized protoplanet astronomers call Theia.

Astronomers have uncovered evidence of a bizarre, potentially historic discovery: the first moon ever detected beyond our ...

Most scientists think that Earth and Mars took shape this way from rocky pieces swirling around the young sun around 4.5 ...

"Family feels kind of suffocating.""I can't help but feel hurt by my parents' words."Have you ever worried about things like ...

Discovery suggests raw ingredients for life are common in the dusty discs out of which planets are born.

In our solar system's corner of the galaxy, stars rarely collide. It makes sense: Space is vast, and stars have room to roam.

As far-fetched as it may seem, quirks of orbital mechanics could allow hundreds of planets to be packed around a star ...

Remember school days in the 1970s? From metal lunch boxes to handwritten report cards, revisit 12 school routines kids rarely ...

Where did it start? How did it grow complex? Why did it get big? Three moments in Earth’s early history when evolution ...

California's new Plug and Play Solar Act allows renters and homeowners to easily generate their own electricity with small, ...