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.

A rare 'planetary parade' will be visible to the naked eye in the UK this week, as Venus, Mars, Jupiter and Saturn sit in a ...

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

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

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

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

Although planets are technically always ‘aligned’ because they orbit the solar system on the same plane (the ecliptic), it’s ...

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

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

Starting at 12:30 p.m. ET (1730 GMT) on Saturday (Jan. 25), astrophysicist Gianluca Masi of the Virtual Telescope Project ...

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 ...