There's a lot we don't know about our solar system, but that means we're always learning new stuff, like how much weight our neighbors have lost.

Mercury has been shrinking since it formed in our solar system's early days. New evidence, though, suggests it used to be ...

It's deflating even faster than we thought. The post The Planet Mercury Appears to Have Shrunken Drastically, “Like a Balloon ...

Mercury may have shrunk much more than scientists previously believed, according to a new study based on detailed ...

Findings from a recently published paper by Smithsonian senior scientist Thomas R. Watters reveal that Mercury has managed to retain much more of its interior heat than previously thought. Images and ...

Planetary scientists have long known that Mercury has been shrinking for billions of years. Despite being the closest planet to the sun, its interior has been cooling down as internal heat leaks away.

The BepiColombo mission, by the European Space Agency and the Japan Aerospace Exploration Agency, is only the third to study our smallest planetary neighbor ...

Although Mercury was geologically active in its early days, today its surface appears almost completely static. This is why it is often perceived as a dead and dry planet. A new study led by Dr.