August is full of celestial events, and this week marks a milestone for the 4.503 billion-year-old planet known as Mercury. Being such a small planet that lies close to the sun, Mercury can be ...

Mercury will be farthest from the sun on Tuesday (Aug. 19), granting early risers a perfect opportunity to spot the fleet-footed world somewhat separated from the glare of our parent star. Mercury ...

A collision with an asteroid might have set the planet Mercury whirling oddly in its orbit, a new study suggests. When one body orbits another — say, a moon around a planet or a planet around a star — ...