13 June 2011, 10:24 AM ET
Each week we investigate lingering questions about cosmic objects. Now batting: Mercury.
27 May 2011, 12:49 PM ET
Look to the skies this Memorial Day weekend to see four planets near the moon.
11 May 2011, 01:41 PM ET
Over the next two weeks, the four brightest planets, Mercury, Venus, Mars, and Jupiter, perform a complex dance at dawn
06 May 2011, 07:35 AM ET
See Venus, Jupiter, Mercury and Mars together in the predawn sky over the next week.
05 May 2011, 12:19 PM ET
NASA commemorated the launch and landing of the first American spaceflight to honor its 50th anniversary.
05 May 2011, 06:00 AM ET
On the anniversary of Alan Shepard's flight, America is at a turning point in space.
04 May 2011, 06:27 PM ET
NASA's history-making first human spaceflight and Messenger mission to Mercury will live on as U.S. postage stamps.
04 May 2011, 04:10 PM ET
In late May and early June, the Moon will appear to dance from day to day with Jupiter, Mercury and Venus. This animation looks East at 5:00am from the U.S. East Coast. Viewers with telescopes can also spot Uranus, Neptune and Ceres in this ballet.
03 May 2011, 03:50 PM ET
From spacesuits to tissue boxes that have been to the moon, a mixed bag of items for sale.
03 May 2011, 01:33 PM ET
Mercury astronaut's Alan Shepard and John Glenn, along with flight controller Chris Kraft and recovery operations chief Bob Thompson recount the historic first American manned flight into space; Freedom 7 launched Sheppard on May 5, 1961.
28 April 2011, 02:46 PM ET
Skywatching tips for how you can view six planets aligned above the rising sun.
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.