Mercury, the closest planet to the Sun, is a world of blazing heat, freezing nights, and endless mysteries. Recent photos ...

The spectacular discoveries NASA's MESSENGER made about Mercury.

Mars shines in the evening, and is joined briefly by Mercury. Jupiter joins Venus as the month goes on. And all month, look ...

NASA also points out that July and August is an excellent chance to view the constellation Aquila, also known as the eagle as ...

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

Debris from Mercury's heavily cratered surface could have reached Earth, so why haven't we found meteorites from the ...

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

On July 4, Mercury will reach its greatest eastern elongation from the Sun, making it visible from Earth. While not as bright ...