Mercury, First Planet From the Sun: Latest Discoveries
Mercury is our solar system's smallest planet.
NASA's Messenger spacecraft is the first dedicated to orbiting Mercury, the solar system's innermost planet.
NASA's Messenger mission is the first ever set to orbit the planet Mercury.
NASA's Messenger probe will photograph previously unseen regions of Mercury's south pole.
The audience erupted in applause as NASA's Messenger probe arrived in orbit around Mercury, becoming the first spacecraft ever to do so.
The U.S. Postal Service is issuing a stamp for NASA's Mercury mission and astronaut Alan Shepard.
NASA's Messenger spacecraft will study Mercury from orbit for the next 12 months.
NASA's Messenger spacecraft will become the first probe ever to orbit the solar system's innermost planet.
Here are 10 interesting features of the $446 million Messenger spacecraft and its mission to the planet Mercury.
After more than six years of spaceflight, NASA's Messenger probe is almost ready to begin investigating some key questions about the planet Mercury.
NASA's Messenger probe will become the first spacecraft ever to enter into orbit around the solar system's innermost planet.
Watch the Mercury orbit insertion maneuver and the spacecraft’s first orbit around the planet.
The elusive planet Mercury is bright and visible to skywatchers as NASA's Messenger probe nears the planet.
NASA's Messenger spacecraft arrives in orbit around Mercury on Thursday, March 17.
Next week NASA's Messenger spacecraft will become the first probe to orbit Mercury.
NASA's Messenger probe promises to show us a whole new Mercury when it arrives in orbit around the planet next week.
Jupiter's 12-year orbit around the sun is carrying it out of Earth's evening skies.
The new moon of March arrives Friday. Here's how to see the first sliver the new moon.
A new Mercury probe has survived a scorching test run in a giant oven, showing that the craft can withstand the hellish heat of the solar system's innermost planet. The BepiColombo mission is slated to launch in August 2013.