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

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

All of our solar system’s planets are lining up to parade through the night sky at once. This extraordinary celestial event will see the sky scattered with seven visible planets in what is known ...

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 ...

"What If is an epic exploration of possibilities. What If is a Webby Award-winning science web series that takes you on a ...

Especially since all seven of the other planets in our solar system are about to become visible at once in a great planetary ...

An object we thought belonged to the most common category of planet in the galaxy has turned out to be something we've never ...

The six planets were visible in the days immediately leading up to Jan. 21, and for about four weeks afterward. Mars, Venus, ...

Study reveals an interstellar object's impact on planetary orbits, reshaping solar system dynamics. Discover how simulations ...

A new study suggests that a planet-sized object may have passed through the solar system billions of years ago.

The cosmos, full of endless wonders and mysteries, keeps throwing us celestial curveballs. In a revelation that could reshape ...