The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...

Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

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

Scientists suggest an interstellar visitor may have altered planetary orbits in our Solar System, reshaping trajectories of ...

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

Further simulations on flybys into the inner Solar System revealed one of our own planets might be flung out of the ballpark ...

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

All of our solar system's planets are lining up to take part in a rare and awesome event in the night sky - this is when and ...

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

The research, yet to be peer-reviewed, sheds light on what could have changed the orbits of several planets in the solar ...

A rare celestial event where seven planets align is visible in the UK skies. Discover how, when, and where you can observe ...

Here’s how it works. A planet-size object that possibly once visited the solar system may have permanently changed our cosmic neighborhood by warping the orbits of the four outer planets ...