They’re not a perfect match, but it’s way too hot on the first planet for us to hop over and confirm for ourselves.

Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to ...

With a total volume little more than the Moon, it is the smallest planet in the Solar System and is situated the closest to the Sun. Mercury has no atmosphere to retain heat, meaning that the ...

Scientists may have solved alongstanding mystery in the study of Mercury. For the first time, pieces of the Solar System’s ...

Pieces of Mercury may have been found on Earth, potentially allowing scientists to study the Solar System's innermost planet.

A meteor shower, a planet sighting, and a full moon. Here's how to see all of space's eye-catching activity in July.

As the closest planet to the Sun, Mercury is exposed to the star's enormous gravitational field. And it's really stressful.

Mercury turns out to be similar to the Moon at 0.119, while Venus’ albedo is by far the highest of all planetary bodies in the Solar System at 0.90. So not only does Mercury receive four times ...

Mercury retrograde is, more or less, an optical illusion. ... Hold tight, the motion of the solar system is about to get bumpy. Anna Kaufman, USA TODAY. Updated Fri, April 12, ...

If the orbits of all the significant bodies in the solar system are averaged together into one master plane of rotation, the Earth's orbit falls close to the average, deviating by only 1.6 degrees.