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 ...

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

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

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

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

An alignment of seven planets will be visible in Friday's evening sky. Here's when and where to view the celestial phenomenon ...

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

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

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

Seven planets will line up for a rare "planetary parade" today (Feb. 28) and you can watch it live online, beginning at 12:00 ...

An advanced imaging system developed at the University of Arizona boasts a shape-shifting mirror that delivers observing ...