The shape of a planet's orbit is one of its fundamental properties, along with its size and distance from its host star.

With a sun more than 4.5 billion years old, our solar system is considered "middle-aged," and the pictures of what it might ...

When a mudflat crumbles on Earth, or an ice sheet splinters on one of Jupiter's moons (Europa), or an ancient lakebed breaks ...

After Friday's spectacle, a "planet parade" of this size won't appear in the night sky for several years, experts say.

On Feb. 28, seven planets—Mars, Jupiter, Uranus, Venus, Neptune, Mercury, and Saturn—will all grace the early evening sky.

A spectacular solar display will be seen on Friday, Feb. 28, as seven planets will be visible through binoculars, a telescope or even the naked eye during the evening's full "planet parade." ...

Beginning around sunset, Saturn will be situated closest to the horizon, followed by Mercury, Venus, Jupiter and Mars higher ...

Another finding was how dramatically the planets varied in brightness over just three years. The team discovered that PDS 70 ...

Everybody loves a parade. Most people who live in chillier climes aren’t exactly rejoicing when February rolls around — but ...

Mercury, Venus, Mars, Jupiter, Saturn, Neptune and Uranus could be visible, but not all can be seen by the naked eye.

After Friday's spectacle, a "planet parade" of this size won't appear in the night sky for several years, experts say.

If you haven't caught the "planet parade," don't despair. This Friday should offer the best glimpse of one of the most elusive planets.