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

Earth, HD 20794 d, orbiting a nearby sun-like star, offering a promising lead in the search for life beyond our planet.

Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's responsible for the orbits of the planets and their satellites, but there ...

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

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

Astronomers may have discovered a scrawny star bolting through the middle of our galaxy with a planet in tow. If confirmed, ...

While most models of solar system formation predict perfectly circular and coplanar orbits for the planets, reality presents a slightly different picture. Successful Simulations: Approximately 1% ...

Long ago, a planetary object eight times the mass of Jupiter may have once visited the solar system and altered […] The post ...

When you first learned about the Solar System, you probably saw diagrams that made it look orderly, with planets arranged in circular orbits around the Sun on a flat disk. But in reality, our Solar ...

Beyond Neptune lies the Kuiper Belt, a vast expanse of icy bodies that may hold clues to the solar system’s formation. These ...

A new study claims it is possible an "alien visitor" could have warped our solar system during its earliest years.

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 ...