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

Stargazers will be treated to a dazzling six-planet "alignment" this January.

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

Six of our cosmic neighbors are expected to line up across the night sky tonight, in what has been dubbed a "planetary parade ...

2025 is starting off with a bang for skygazers, with a planet parade now visible in the night sky. A planet parade is when ...

A powerful new tool comes online this year that could help astronomers locate the mysterious planet hiding somewhere beyond ...

Six planets are parading across the sky, appearing as some of the night's brightest stars. A few easy tips can help you ...

A new study claims it is possible an "alien visitor" could have warped our solar system during its earliest years.

When you first learned about the Solar System, you probably saw diagrams that made it look orderly, with planets arranged in ...

Worlds will align for a "planetary parade" in January, with four bright and easily visible to the naked eye. But an even ...

In the early evening, look to the southwest and you'll see Venus (the brightest object in the sky after the Sun and Moon) and ...