The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's ...

The alignment of seven planets in the night sky has captivated observers for centuries, inspiring awe and curiosity. This ...

Simpson and Chen ran mathematical models looking at how differently sized Earth-like worlds would have affected the rest of ...

Six planets grace the sky this month in what's called a planetary parade — Venus, Mars, Jupiter and Saturn are visible to the ...

A new study, currently under review for publication, suggests that an ancient cosmic visitor might have significantly altered the orbits of our solar system's giant planets. Scientists propose that ...

Planets are formed when dust and rock in a disk around a young star collide and combine to form ever larger bodies. This ...

The latest update for Sins of a Solar Empire 2 brings some icy variety to the galaxy, adds new ship artifacts, and tweaks the game's AI.