As the United States prepares to celebrate its 250th anniversary, the history of the solar system tells its own story of ...

Snapchat Planets turns your friendship ranking into a tiny social solar system, where being Mercury is elite and Neptune ...

You start your day hearing wild news. Jupiter has just swallowed Saturn. And it doesn’t stop there. Jupiter is on its way to ...

The rusty world is full of mysteries—and some of the solar system's most extreme geology. Learn more about Earth's smaller, colder neighbor.

Some researchers see in this population the manifestation of an invisible presence, a new planet not yet discovered in the dark and cold confines of our solar system. Others, however, think that there ...

Mars is the fourth planet from the sun and has a distinct rusty red appearance and two unusual moons. The Red Planet is a ...

It's an evocative idea that has long bedeviled scientists: a huge and mysterious planet is lurking in the darkness at the edge of our solar system, evading all our efforts to spot it. Some astronomers ...

CAPE CANAVERAL, Fla. — Astronomers have discovered a rare solar system in the Milky Way that boasts six planets orbiting in perfect rhythm like a cosmic orchestra, untouched by outside forces since ...

There may be another world lurking between the orbital lines of our solar system. Astronomers in Japan have published their theory of an “Earth-like planet,” dubbed Planet Nine, that’s hiding in plain ...

Astronomy.com: We were going to write something new about Pluto here. But Astronomy Magazine editor Dave Eicher has already done the heavy lifting. Before we get to the experts here’s how Dave ...

In context: The Oort cloud is a cloud-like structure that scientists believe surrounds the Solar System, essentially behaving like the outermost limit of the Sun's gravitational influence in the Milky ...