Mercury

The tiny planet Mercury scooted across the sun's face today (Nov. 11) for the last time until 2032, and skywatchers around the world had the chance to witness the rare celestial event.

The tiny planet Mercury will be visible from Earth as it moves across the sun, in an event known as a transit.

The Mercury transit on Nov. 11 will be accessible to amateur astronomers, as long as they have the right equipment to view it safely.

Astronomers have discovered a large valley on Mercury that provides further evidence for the planet's shrinkage — an odd phenomenon that has been the topic of debate for decades.

A new video shows the highest- spatial- resolution view of Mercury migrating across the surface of the sun. The images were captured by the New Solar Telescope in California, on May 9.

The 2016 transit of Mercury has come to a close. The solar system's smallest planet took about 7.5 hours to pass across the disk of the sun, and was seen by sky watchers all over the globe.

Today (May 9), Mercury will pass across the face of the sun. Here's how to watch the event online, and hear scientists and other experts talk about this rare celestial happening.

A baffling new mystery has turned up on Mercury — a pattern of giant cliffs and ridges on the planet's surface that defies any explanation that scientists have currently been able to offer.