14 March 2013, 01:59 PM ET
NASA's Solar TErrestrial RElations Observatory (STEREO) snapped imagery of the comet as it flew between the two planets. A three day time-lapse (March 9-12, 2013) was compiled from the photos.
11 March 2013, 07:00 AM ET
The first spacecraft to orbit Mercury will have to shut down soon, unless it gets a mission extension.
06 March 2013, 06:35 AM ET
NASA's Messenger probe snapped photos of 100 percent of the planet's surface.
27 February 2013, 06:00 AM ET
Observations from NASA's Messenger probe indicate Mercury was once roiling with magma.
22 February 2013, 03:49 PM ET
See amazing photos of Mercury taken by MESSENGER spacecraft in April 2011 through 2012.
22 February 2013, 03:00 PM ET
The new Mercury video by NASA's Messenger spacecraft shows an oddly colorful planet.
19 February 2013, 06:24 PM ET
Thousands images from NASA MESSENGER's wide angle camera comprise this rotating false-color mosaic map. The visible colors are correlated with variations in Mercury's surface spectral reflectance.
11 February 2013, 11:09 AM ET
Find out when and where to look for the pink-looking planet.
11 February 2013, 08:20 AM ET
The closest planet to the Sun (looking pinkish because of the hues of the setting Sun) and the Red Planet will be visible for all to see in February 2013. Find out when and where to look.
08 February 2013, 06:30 AM ET
February offers the best opportunity to spot Mercury in the night sky.
25 January 2013, 05:34 PM ET
On January 23rd, 2013, eruptions on the Sun sent coronal mass ejections in front of Mercury and in the direction of Earth (strong impact not expected). NASA's SDO and STEREO spacecrafts captured the imagery.
03 January 2013, 06:00 AM ET
A brief rundown of the intrepid spacecraft currently sending data home from beyond Earth orbit.
30 November 2012, 07:00 AM ET
Life's raw materials may be common throughout the solar system.
29 November 2012, 05:50 PM ET
Mercury is the closest planet to the sun, yet still has shadowy secrets.
29 November 2012, 04:46 PM ET
Billions of tons of water ice hides in frozen pits at the north pole of the hot planet Mercury.
29 November 2012, 03:34 PM ET
It has been estimated that there may be up to 1 trillion metric tons of water ice on Mercury. Scientist David Lawerence explains how NASA's MESENGER mission's neutron spectroscopy data contributed to the find.
29 November 2012, 02:01 PM ET
Vast supplies of water ice and organic material on Mercury were found by NASA's Messenger probe.
29 November 2012, 10:19 AM ET
You may need to rise early to see Mercury, but Jupiter is unmistakable in the night sky.
20 November 2012, 02:56 PM ET
The contraction of the planet Mercury pulled the surface together, but new formations created by stretching have recently been found near squeezed features.
13 November 2012, 10:30 AM ET
The picture was snapped by NASA's Messenger spacecraft.
31 October 2012, 01:52 PM ET
The Mariner 10 spacecraft gave us the first close-up view of the sun's closest planet.
26 October 2012, 05:00 PM ET
The rocky, metallic worlds of the inner solar system look quite different from those of the outer solar system, one theory supposes they formed in much the same way. However, a competing theory suggests they may have formed from different components.
12 October 2012, 01:46 PM ET
Cookie! A new photo from NASA's Messenger spacecraft looks a lot like Sesame Street's Cookie Monster.
27 September 2012, 02:33 PM ET
NASA's Messenger mission has spent several years mapping Mercury, which was poorly understood for decades.
24 September 2012, 07:26 AM ET
The surface of Mercury is unlike that of any other planet in our solar system.
09 August 2012, 10:19 PM ET
See sky maps to help spot the skywatching events of August 2012.
27 June 2012, 08:00 AM ET
Harvey Allen's contribution to space travel revolutionized fundamentals of the science.
23 June 2012, 06:22 AM ET
See the most amazing space images of the week, including China's mission to space and Mickey Mouse on Mercury.
18 June 2012, 12:40 PM ET
NASA's Messenger spacecraft orbiting Mercury spotted three craters that look surprisingly like Mickey Mouse.
01 June 2012, 11:28 AM ET
NASA's Solar and Heliospheric Observatory (SOHO) snapped imagery of Venus, almost past Mercury, in anticipation of the Venus Transit of the Sun on June 5-6, 2012 (depending where you are in the world).
22 May 2012, 02:01 PM ET
NASA's Solar and Heliospheric Observatory (SOHO) caught Jupiter, Mercury and the Pleiades Star Cluster converging within its camera's field of view.
09 April 2012, 07:41 AM ET
On April 7th 2012, a coronal mass ejection was lofted towards Mercury and set to slam into its ultra-thin atmosphere on April 9th. The Solar Dynamics Observatory captured the blast in extreme ultraviolet.
04 April 2012, 12:56 PM ET
Mercury is nearly as bright as other naked-eye planets, but there's a trick to spotting the elusive planet.
31 March 2012, 01:59 PM ET
From water on Mars to fake feline astronauts, it's been a busy week in space. Vote for the week's best space story.
26 March 2012, 02:57 PM ET
Mercury's poles may have ice deposits, according to new findings from NASA's Messenger probe.
26 March 2012, 02:10 PM ET
NASA's MESSENGER spacecraft is the first to ever to orbit the planet closest to the Sun. It has delivered 89 wide angle camera images that have been compiled into a complete picture of the planet's south pole in this time-lapse video.