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

From January to March, the night sky will host a spectacular parade of planets featuring Venus, Mars, Jupiter, Saturn, Uranus ...

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 ...

NASA’s Voyager mission completed humankind’s first close-up exploration of the four giant outer planets of our solar system.

HELENA — The planets are aligned. Six planets, Mars, Jupiter, Uranus, Neptune, Venus and Saturn can be seen in the night sky.

Stargazers who haven’t had a chance to check out this month’s planet parade will want to look up soon because there’s ...

Uranus and Neptune are there too, technically, but they don't appear as 'bright planets'," NASA's Preston Dyches explained in a stargazing video guide. Stock illustration of all the solar system's ...