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 ...

There's plenty more planet mayhem to come throughout the week. Today, the Moon enters its first quarter, which many will know ...

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

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

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