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

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

The eight planets in our solar system orbit the sun in roughly the same plane, because they all originally formed from the same disc of debris around the sun. The line the sun traces across the ...

The eight major planets of our Solar System orbit the Sun in the same flat plane, and all at different speeds. Mercury, the closest planet to the Sun, completes an orbit – a year for the planet ...

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

Referred to as a planetary parade or alignment, this celestial event occurs when multiple planets in our solar system appear ...

Stargazers will be treated to a rare alignment of seven planets on 28 February when Mercury joins six other planets that are already visible in the night sky. Here's why it matters to scientists.

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, a ...