01 March 2012, 11:43 AM ET
The planet Mercury looks a little bit like Earth's moon.
01 March 2012, 11:24 AM ET
Mercury is the closest planet to the sun.
27 February 2012, 12:32 PM ET
Jupiter and Venus lined up with the moon, and will get even closer together in March.
27 February 2012, 12:31 PM ET
See amazing photos of Venus, Jupiter and the moon in a celestial triple conjunction.
25 February 2012, 12:02 PM ET
Venus, Jupiter and Mercury can be seen near the moon at sunset. Mars makes an appearance.
24 February 2012, 11:58 AM ET
Jupiter, Venus and the crescent moon will shine extra bright just after sunset in the western sky this weekend.
17 February 2012, 05:46 PM ET
The best time to see planet Mercury in the evening sky in 2012 is next week.
11 January 2012, 06:00 AM ET
Retired NASA spaceflyer Steven Hawley also discussed his own experiences.
22 December 2011, 02:00 PM ET
The mystery of Mercury's weak magnetic field may be solved.
21 December 2011, 02:00 PM ET
Don't miss the seven major planets of the solar system in the night sky this week.
18 December 2011, 06:25 AM ET
From new ways to get to space to fiery death plunges into the sun, it was a busy week in space.
12 December 2011, 02:08 PM ET
NASA's Dawn mission currently orbiting Vesta has revealed signs of differentiation - a process where dense materials sink to the center and less dense rise to the surface. This is a characteristic of a terrestrial planets such as our own.
11 December 2011, 01:00 PM ET
New research suggests a giant asteroid may have knocked into Mercury and changed its spin.
10 December 2011, 08:00 AM ET
From a comet diving into the sun to planets made of diamonds and more, it was a busy week in space.
17 November 2011, 08:15 AM ET
The extension will keep Messenger in orbit around Mercury until March 2013.
11 November 2011, 03:03 PM ET
The space rock apparently formed out of the same stuff that became Earth, Venus and Mercury.
29 September 2011, 02:00 PM ET
NASA's Messenger probe has discovered some seriously weird stuff about planet Mercury.
29 September 2011, 12:46 PM ET
The planet closest to the Sun has a magnetosphere like the Earth, but at its poles, the Sun's powerful force takes it toll by super charging sodium and oxygen particles and blasting them into space. NASA's MESSENGER probe weathers the storm.
29 September 2011, 09:08 AM ET
NASA will announce the new Mercury discoveries at 2 p.m. EDT today.
20 July 2011, 03:33 PM ET
Mercury is reaching its eastern most point in the night sky tonight.
28 June 2011, 11:09 PM ET
Look for Mercury in the northwestern sky just after sunset between June 30 and July 10.
16 June 2011, 05:30 PM ET
NASA's Messenger probe is already revealing intriguing new details about Mercury.
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.