Living up to its name, Mercury is the fastest planet in the solar system, speeding along at about 29 miles per second and ...

August's “planet parade” (also called an alignment) features six planets, four of them visible to the naked eye. Here’s when ...

Since its fiery birth nearly 4.5 billion years ago, Mercury, the smallest planet in our solar system, has been slowly ...

Mercury, the smallest planet in the solar system, has spent billions of years quietly getting even smaller. Since its fiery ...

Mercury, the smallest planet in our solar system, has a magnetic field that has intrigued scientists for decades. Recent ...

The planet Mercury could have a layer of diamonds up to 18 kilometers, or 11 miles, thick, tucked below is surface, scientists say.

Astronomers propose a new hypothetical planet, Planet Y, beyond Neptune, based on observed orbital anomalies in the Kuiper ...