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 ...

To get a glimpse of the “Swift Planet,” EarthSky suggests waiting for the sun to set before looking west for the 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.

Mercury doesn't give up its secrets easily. The smallest planet in our solar system is also one of the most extreme—a ...

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

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

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

Stars passing close to the sun could cause planets to collide, including with Earth, or even be ejected as rogue planets, new ...

The sun rises from the east, and sets in the west - this is a well-established fact for the longest time, and this is due to ...