17 March 2014, 06:26 PM ET
New information from NASA's MESSENGER solves the contradiction between the evidence of shrinking on the planet's crust and the models for heat loss in its core.
05 March 2014, 04:18 PM ET
Mercury, the elusive planet that orbits closest to the sun, makes an appearance this month in the dawn sky.
07 February 2014, 10:51 AM ET
A probe orbiting Mercury has beamed more than 200,000 images to ground controllers on Earth, and it's still going strong.
06 February 2014, 09:27 AM ET
The planets location in the nightsky are pinpointed (you'll need binoculars or a telescope to spot Uranus and Neptune). Also, Comet's Lovejoy, Siding Spring and Linear can be viewed.
31 January 2014, 12:46 AM ET
Scott Carpenter, one of the original Mercury astronauts, explored space and later the sea.
30 January 2014, 12:49 AM ET
Deke Slayton was selected for the Mercury program, but had to wait more than a decade to fly in space after concerns about an erratic heartbeat pulled him out of the flight rotation.
29 January 2014, 06:33 PM ET
Stargazers have the best chance of the year to spot Mercury in the evening sky over the next week, but only if you know how to find the elusive planet.
28 January 2014, 06:24 PM ET
Night sky photographer Chris Schur captured two rare shots of Venus and Mercury in the daytime sky from Payson, Ariz., in January 2014. See how he did it here.
27 January 2014, 12:43 PM ET
Photographer Justin Ng captured the glow of inner solar system dust scattering sunlight over 3 Indonesian volcanoes, the active Semeru and Bromo plus the dormant Batok. Planets Venus, Saturn and Mercury lie within this field of view.
20 December 2013, 12:30 PM ET
Beatles legend John Lennon, "Breakfast at Tiffany's" author Truman Capote and sculptor Alexander Calder are among the 10 artists and writers now immortalized on Mercury with impact craters bearing their names.
06 December 2013, 05:53 PM ET
A volcano on Mercury may have been active over an unprecedented billion-year time span.
26 November 2013, 05:05 PM ET
NASA's STEREO-A spacecraft has had its eyes set on the comet for the past few days and has delivered the best time-lapse to date. Comet ISON and the smaller Comet Enke, along with Earth and Mercury can be seen. (looped 3X)
25 November 2013, 07:16 PM ET
If you look to the sky early Tuesday (Nov. 26) morning, you might get a view of what can only be described as a "double planet" visible through the brightening dawn twilight.
22 November 2013, 10:06 AM ET
As the possible 'comet of the century' (ISON) nears the Sun, it has come within the viewing range of the NASA Sun observing satellite. Earth, Mercury and the further away Comet Enke were all visible to the spacecraft on Nov. 21, 2013. (looped)
19 November 2013, 11:35 AM ET
The planet Mercury is known in some circles as the "elusive planet," but over the next two weeks, skywatchers will have an excellent opportunity to see Mercury in the early morning dawn sky.
17 November 2013, 07:30 AM ET
NASA's MESSENGER probe will watch as comets Encke and ISON cruise by Mercury on Monday and Tuesday. The back-to-back close passes offer a golden opportunity to study two comets passing close to the sun, researchers say.
15 November 2013, 07:01 PM ET
NASA's MESSENGER spacecraft will have its eyes set on Comet's ISON and Encke as they fly-by Mercury on Nov 18 and 19th, 2013. The Mercury probe will analyze the chemical makeup of the comets and snap pictures.
15 November 2013, 03:19 PM ET
A NASA probe in orbit around Mercury spotted and photographed two comets set for close brushes with the sun this month.
13 November 2013, 05:18 PM ET
This week in the hour before sunrise early morning stargazers will get a double treat: the planet Mercury and two special comets.
08 November 2013, 03:57 PM ET
On 4 October 2013, NASA acquired 560+ images from the MESSENGER spacecraft orbiting Mercury. Hundreds of miles of scorched, asteroid impacted surface have been compiled and set to the 'HI-FI SCI-FI' sounds of Atom Strange.
01 November 2013, 05:06 PM ET
You can expect to see Venus, Jupiter, Mars, Mercury and Saturn this November with only an average telescope.
16 October 2013, 10:58 AM ET
Just like the moon, Mercury is a desolate, rocky and airless body, albeit a bit bigger than Earth's satellite, said Sean Solomon, the principal investigator for NASA's Messenger mission to Mercury.
10 October 2013, 05:08 PM ET
See photos from Mercury astronaut Scott Carpenter's historic Aurora 7 orbital flight on May 24, 1962.
04 October 2013, 03:49 PM ET
The moon will meet up with three different planets in the evening sky during two separate celestial encounters, one on Sunday and the other on Tuesday. The first will involve Saturn and Mercury, while Venus is the moon's partner for the second.
18 September 2013, 07:39 PM ET
Canopus is the second-brightest star in the night sky despite its distance from Earth.
29 August 2013, 05:11 PM ET
NASA's Jet Propulsion Laboratory's former director talks about the mission that completed fly-bys of Venus and Mercury in the 1970's.
31 July 2013, 11:48 AM ET
Saturn, Venus, Mars, Mercury and Jupiter will all be visible in the August night skies, as will the annual Perseid meteors. A number of nebulas will also be easy to find among the constellations.
10 July 2013, 10:00 AM ET
Nearly two dozen museums and other locations around the U.S. (plus one in England) boast real spaceships that have carried astronauts on missions to orbit and the moon.
03 July 2013, 01:01 PM ET
Extreme volcanism may be responsible for Mercury's artificially young surface.
20 June 2013, 01:50 PM ET
Mercury and the solstice make this a can't-miss week in skywatching.
13 June 2013, 01:22 PM ET
The brighter planet Venus leads the way.
07 June 2013, 03:40 PM ET
Pick out three cosmic wonders in the night sky next week.
05 June 2013, 12:52 PM ET
Use brilliant Venus to point the way.
04 June 2013, 10:57 AM ET
Look for Mercury, Venus and Jupiter in close proximity in early June, a rare meteor shower in mid June, and near earth asteroids throughout the month.
26 May 2013, 10:10 AM ET
Jupiter, Mercury and Venus will shine in a cosmic triangle just after sunset tonight (May 26).
24 May 2013, 03:48 PM ET
Three planets are teaming up for a Memorial Day planet parade.