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

HD 20794 d completes its orbit just shy of two Earth years, placing it well within reach of conditions that might harbor life ...

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

Baker said that there are other astronomical events that may be more interesting than the parade of planets. Baker said Mars ...

Astronomers have found some pretty wild exoplanets. Some are balls of lava the temperature of hell, one is partially made of ...

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

Six of our cosmic neighbors are expected to line up across the night sky tonight, in what has been dubbed a "planetary parade ...

Plate tectonics give Earth its mountains, earthquakes, continental drift and maybe even helped give rise to life itself. But ...

A super-Earth planet that dips in and out of its star's habitable zone has been discovered just 19.7 light-years away.

Scientists found an intriguing world in our galaxy.

An exoplanet is a planet outside our solar system that usually orbits a star in our galaxy. More than 7,000 have been found ...

Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's ...