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

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

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

Whether it's rivers cutting through earth, lava melting through rock, or water slicing through ice, channels all twist and ...

It is being called a "planetary parade" as seven planets are expected to be seen in the Earth's night sky on Friday, ...

A stunning planet parade is now visible in the night sky. A planet parade is when several of our solar system's planets are ...

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.

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

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

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." ...