With a radius of 2,106 miles, Mars is the seventh largest planet in our solar system and about half the diameter of Earth. Its surface gravity is 37.5 percent of Earth’s. Mars rotates on its ...

Now's a great time to invest in such a scope, too. Mars and Jupiter appear close ... If you'd prefer to gaze beyond our solar system, we've selected the best telescopes for deep space.

Mars's moon Phobos is so strange that no one knows how it formed. But a forthcoming mission could solve this mystery - and a host of other puzzles connected to the solar system's deep past ...

Stock illustration of all the solar system's planets. Mars, Venus, Jupiter, Saturn, Uranus and Neptune will be visible all at once this month. Stock illustration of all the solar system's planets.

Mars's atmosphere and climate ... "The expansion of the magnetosphere-ionosphere system can lead to atmospheric loss and enhanced interaction with solar radiation or cosmic rays.

The rover's 26th sample, known as "Silver Mountain," has textures "unlike anything we've seen before," NASA says.

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.

In the depth of winter, a sweeping view of our solar system will glow in the night sky. In total six planets will be visible, four of them to the naked eye - Venus, Mars, Jupiter, and Saturn.VIDEO ...

The Romans had different names for the Greek gods, and so they were the ones to eventually call it Mars. Jupiter is the biggest planet in our Solar System, and it gets its name from the leader of ...

The sun is currently at solar maximum. This means that the ... Part of MAVEN's capabilities includes an "early warning system that lets other Mars spacecraft teams know when radiation levels ...