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

Mars, Venus, Jupiter and Saturn should be visible to the naked eye, but get a telescope and you can spot Neptune and Uranus.

Delve into the wonders of Venus—the beautiful and extreme planet of our Solar System. Experience its stunning visuals in 4K resolution as we uncover its secrets, from its fiery surface to ...

in 4K HD. The building blocks of life could have been delivered to solar system dwarf planet Ceres by one or more space rocks from the outer asteroid belt. NASA OSIRIS-REx asteroid sample return ...

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

Worlds will align for a "planetary parade" in January, with four bright and easily visible to the naked eye. But an even ...

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

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, a new study suggests. The ...