A new study suggests that a massive structure beyond Jupiter trapped the cosmic dust needed to form the first building blocks ...

A rare meteorite discovered in the Sahara Desert proves that our solar system almost had at least one extra planet. In a ...

Scientists found proof that a giant early planet existed in the solar system 4.5 billion years ago.

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.

Earth, our home planet, is a world unlike any other. The third planet from the sun, Earth is the only place in the known universe confirmed to host life. With a radius of 3,959 miles, Earth is the ...

The Sun is an incandescent but benevolent dictator. For billions of years, it’s kept our star system well organized through the influence of its powerful gravity. All the planets revolve around it on ...

The search for an unknown planet in our solar system has inspired astronomers for more than a century. Now, a recent study suggests a potential new candidate, which the paper’s authors have dubbed ...

On ‘Star Wars day’, researchers more than double the number of potential known ‘circumbinary’ planets like the fictional Tatooine, home to Luke Skywalker ...