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 planets seem to defy established rules. This is the case for hot Jupiters orbiting extremely close to their stars... in binary systems where two stars coexist. A new study proposes an explanation ...

An exoplanet is what we call planets that exist outside of our own solar system. The first one was discovered in 1992, but as we get more powerful and precise telescopes and instruments, scientists ...

An international team has made a significant breakthrough in understanding the tectonic evolution of terrestrial planets. Using advanced numerical models, the team systematically classified for the ...

Earth, our home planet, is a world unlike any other. The third planet from the sun, Earth is the only place in the known ...

What is Planet Nine, and where is it? This question remains one of the biggest mysteries in astronomy. Researchers believe a giant planet may be hidden far beyond Neptune in the distant regions of the ...