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

It's not especially remarkable for a few planets to line up in the sky, but the sight of four or five brilliant planets at ...

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

In the paper, the researchers describe how they modeled the orbits of the four outer planets and performed 50,000 simulations of a large object passing through the solar system to determine if ...

A planet-sized visitor possibly visited the solar system billions of years ago and permanently changed the cosmic neighbourhood by warping the orbital path of four outer planets of the system ...

Four of those planets are close enough ... Right now this is happening a lot because the outer planets take a very long time to go around the Sun and they all happen to be on that side of the solar ...