Neptune, the farthest planet from the Sun, has long been a subject of fascination for astronomers, especially due to its ...

Mark your calendar so you can catch Mercury, Venus, Jupiter, Saturn, Neptune and Uranus in the sky at the same time.

The planet Neptune has a large dark spot "with an unexpected smaller bright spot adjacent to it," inveru observations using ...

Prior to flybys, scientists used mathematical laws and observation to determine the characteristics of the planets.

On Aug. 20, 1977, NASA launched the Voyager 2 spacecraft on a mission to explore the outer planets. Despite its name, this ...

A “planetary parade” — in which Mercury, Venus, Jupiter, Saturn, Neptune and Uranus are aligned — began Sunday and will last ...