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

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 ...

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

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

Tonight and throughout January, stargazers can see a planetary alignment in the night sky or what some are calling a ...

Located less than 20 light years away, HD 20794d could potentially be one of the most Earth-like planets found so far, ...

The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...

Four planets will be in the parade in January, while seven will align in February. Here's how to see the events.

Despite common assumptions, the disk of our Solar System is warped, and the planets travel around the Sun in slightly eccentric (or oblong) orbits. Scientists now think that a mysterious object ...

A team of astronomers have discovered a rather curious exoplanetary system that has two gas giant planets that are messing up each other’s orbit! On of them is 3.8 times the mass of Jupiter and ...