An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit before shoving four of the solar system's planets onto a different course.

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

NASA’s Voyager mission completed humankind’s first close-up exploration of the four giant outer planets of our solar system.

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

Scientists suggested the enormous object disrupted the orbits of Jupiter, Saturn, Uranus and Neptune, which would explain the peculiarities of these four planets' paths. Prevailing solar system ...

Prevailing solar system formation theories indicate that these planets should have at least started out following perfectly circular and share the same orbit. But today, their paths are slightly ...

15, 2025 — New observational data and simulation models have confirmed a new type of planet unlike anything ... a clearer picture of how the outer solar system formed and evolved based on ...

She has covered weird animal behavior, space news and ... orbits of the four outer planets and performed 50,000 simulations of a large object passing through the solar system to determine if ...

It is not often that all the planets in the Solar System other than ours are lined up across the night sky for us to see. The ...