18 April 2011, 09:41 AM ET
The planets Mercury and Mars will appear together on Tuesday, April 19.
01 April 2011, 05:33 PM ET
Here's a look at how to observe the planets of the solar system in 2011.
30 March 2011, 05:26 PM ET
A NASA spacecraft now circling Mercury is set to tackle some of the planet's mysteries – including whether or not water ice lurks in its craters.
29 March 2011, 05:01 PM ET
A stark, gray landscape and big crater dominate the 1st photo of Mercury from orbit.
29 March 2011, 12:00 PM ET
NASA's Messenger spacecraft is the first dedicated to orbiting Mercury, the solar system's innermost planet.
29 March 2011, 06:24 AM ET
NASA's Messenger mission is the first ever set to orbit the planet Mercury.
28 March 2011, 05:20 PM ET
NASA's Messenger probe will photograph previously unseen regions of Mercury's south pole.
18 March 2011, 03:46 PM ET
The audience erupted in applause as NASA's Messenger probe arrived in orbit around Mercury, becoming the first spacecraft ever to do so.
18 March 2011, 01:36 PM ET
The U.S. Postal Service is issuing a stamp for NASA's Mercury mission and astronaut Alan Shepard.
17 March 2011, 08:39 PM ET
NASA's Messenger spacecraft will study Mercury from orbit for the next 12 months.
17 March 2011, 10:00 AM ET
NASA's Messenger spacecraft will become the first probe ever to orbit the solar system's innermost planet.
16 March 2011, 04:57 PM ET
Here are 10 interesting features of the $446 million Messenger spacecraft and its mission to the planet Mercury.
16 March 2011, 08:00 AM ET
After more than six years of spaceflight, NASA's Messenger probe is almost ready to begin investigating some key questions about the planet Mercury.
15 March 2011, 05:41 PM ET
NASA's Messenger probe will become the first spacecraft ever to enter into orbit around the solar system's innermost planet.
15 March 2011, 03:36 PM ET
Watch the Mercury orbit insertion maneuver and the spacecraft’s first orbit around the planet.
14 March 2011, 03:59 PM ET
The elusive planet Mercury is bright and visible to skywatchers as NASA's Messenger probe nears the planet.
14 March 2011, 11:15 AM ET
NASA's Messenger spacecraft arrives in orbit around Mercury on Thursday, March 17.
11 March 2011, 12:01 PM ET
Next week NASA's Messenger spacecraft will become the first probe to orbit Mercury.
11 March 2011, 06:00 AM ET
NASA's Messenger probe promises to show us a whole new Mercury when it arrives in orbit around the planet next week.
06 March 2011, 03:43 PM ET
Jupiter's 12-year orbit around the sun is carrying it out of Earth's evening skies.
03 March 2011, 05:22 PM ET
The new moon of March arrives Friday. Here's how to see the first sliver the new moon.
24 February 2011, 07:56 PM ET
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.
18 February 2011, 03:20 PM ET
NASA's Messenger spacecraft has snapped a solar system family portrait.
17 January 2011, 06:35 PM ET
A list of skywatching events in January 2011 that you don't want to miss.
05 January 2011, 09:38 AM ET
Early risers this week will be treated to a spectacular display: Mercury, Venus, and Saturn will appear just before sunrise.
20 December 2010, 10:00 AM ET
How to best observe the major planets of our Solar System. Some have worlds of their own.
24 November 2010, 04:25 PM ET
The U.S. Postal Service has unveiled the designs for two new space-themed stamps to be released in 2011 to honor Alan Shepard and a mission to Mercury.
19 November 2010, 09:11 AM ET
First Flight for NASA's New Moon Rocket
15 November 2010, 04:07 PM ET
Mercury is the closest planet to the Sun in Earth’s solar system, but has no moons and no substantial atmosphere. Mercury is named after the Roman swift-footed messenger God.
22 September 2010, 04:08 PM ET
Two NASA satellites peering at the sun have snapped photos of Mercury's long, comet-like tail, and it took an interested amateur to bring the pictures to light.
16 September 2010, 07:37 AM ET
Stargazers can get a great look at Jupiter on any clear night for the rest of September. The giant planet, always bright, will be especially hard to miss as it makes its closest pass to Earth for the year.
15 September 2010, 04:00 PM ET
Whenever Messenger zooms close to the sun, the probe makes a search for hypothetical tiny asteroids called vulcanoids.
15 September 2010, 03:50 PM ET
A new photo shows the Earth and moon as seen from deep space by a NASA probe near the sun.
15 September 2010, 07:58 AM ET
Next week is the best 2010 morning apparition of Mercury for northern hemisphere observers.
18 August 2010, 06:00 PM ET
New U.S. postage stamps to be released next year will honor 1st American in space Alan Shepard and NASA's MESSENGER mission to Mercury.
30 July 2010, 03:54 PM ET
A NASA spacecraft that has been studying Mercury, the innermost planet in our solar system, is about eight months away from achieving its main objective of entering the planet's orbit. But, after a series of flybys, the steadfast probe has already unlocke