Mercury is a small, rocky planet about which researchers know relatively little. Two missions, taking readings as they passed ...

The four planets will be visible just before sunrise on the eastern horizon. Stellarium. The optimal time to view it depends ...

The closest planet to our sun, Mercury, experiences extreme temperature variations. Since the planet has no atmosphere to ...

For several days this month, Saturn, Mars, and Mercury appear just degrees apart before sunrise—close enough to watch their ...

India is one of the better places in the Northern Hemisphere to catch this rare planet parade.

On April 18, Mercury, Mars, Saturn, and Neptune align in the sky, but it might be hard to Tennesseans to spot. Here is what ...

Even at a glance, the planets in our solar system are wildly diverse. Huge and small, airless and densely packed with ...

On April 18, Mercury will meet Pluto in a powerful and brutally honest sextile, setting the stage for conversations and ...

Stargazers looking for more to do in April have a few more things coming, including a planet parade where four planets -- ...

A year on Mercury lasts 88 Earth days, with a solar day (the time from noon to noon on the planet’s surface) lasting 176 ...

Rice University researchers recreate Mercury rocks in the lab and find that sulphur plays a structural role inhabited by ...

Astronomers have long been puzzled by a cosmic mystery: planets orbiting two stars—like Star Wars’ Tatooine—are surprisingly rare, even though they should be common. New research suggests the culprit ...