The line that these planets are on is called the ecliptic, which represents the plane of the solar system in which the ...

Mars has two moons, Phobos and Deimos. Scientists still debate whether these came from asteroids that passed close into Mars' ...

Each evening, enjoy a sweeping view of four planets at once. Also look for Mars occulted by the Moon and meteors!

The Sun is an incandescent but benevolent dictator. For billions of years, it's kept our star system well organized through the influence of its powerful gravity. All the planets revolve around ...

The Sun is the most massive object in our solar system, which means it has the most gravitational influence on objects such as planets. In order for a satellite to orbit a planet, it has to be close ...

NASA's record-setting spacecraft was just 3.8 million miles from the sun's surface—the closest any human-made object has ever ...

• Saturn, of magnitude +1.1, 16° to the upper left of Venus. The brighter planet will pass 2.2° north of Saturn on Jan. 18; Saturn will be nearly 11° below Venus on Jan. 31. A telescope reveals Saturn ...