Mercury, the smallest planet in our solar system, has many features that have puzzled scientists for a long time. For […] ...

The solar system's smallest planet is quickly approaching superior conjunction, so catch it in the morning sky while you can.

Astronomers have discovered one of the least habitable planets ever. This tiny world is being melted by its host star, leaving a comet-like tail that stretches millions of kilometers behind it.

The planet is "crumbling to pieces," shedding the equivalent of Mount Everest’s mass every 30.5-hour orbit and will be ...

What is the hottest planet in the solar system? If you want to know which is the hottest star in the solar system, this ...