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

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

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

While most of the planets will be visible to the naked eye, others will require special equipment to be spotted.