01 May 2014, 02:05 PM ET
Models show that Mars should be about as big as Earth if gas and dust were distributed smoothly throughout the protoplanetary disk that surrounded the newborn sun 4.5 billion years ago. But Mars is just 10 percent as massive as our world.
30 April 2014, 01:01 PM ET
The equator of Beta Pictoris b, a gas giant about 10 times more massive than Jupiter, is moving at about 62,000 mph (100,000 km/h), researchers said — far faster than any planet in our solar system.
29 April 2014, 12:00 PM ET
The space agency announced Monday (April 28) that it has issued a Request for Information (RFI), officially seeking ideas from outside researchers about a mission that would study Europa and its subsurface ocean for less than $1 billion.
28 April 2014, 10:09 AM ET
Saturn is close and bright throughout 2014 but maybe best on May 10th ‘opposition,’ its moons visible with telescope. Mars shares the Eastern sky with the ringed gas giant. Skywatching Guide: http://goo.gl/uETMG9
07 April 2014, 05:27 PM ET
Planets abound in the night sky this month, which affords good views of Venus, Jupiter and Neptune. And on Tuesday (April 8), Mars will make its closest approach to Earth in more than six years.
05 April 2014, 08:00 AM ET
Step outside Sunday (April 6) evening to see a rendezvous of two of the brightest objects in the night sky: the moon and the planet Jupiter.
04 April 2014, 07:33 AM ET
Saturn's moon Enceladus and the Jupiter satellite Europa both harbor subsurface seas and should be studied much more closer in the future, researchers say.
26 March 2014, 02:01 PM ET
See images and photos of the icy world 2012 VP113, a potential dwarf planet at the extreme edge of the solar system, in this Space.com gallery.
26 March 2014, 02:00 PM ET
The newfound object, called 2012 VP113, joins the dwarf planet Sedna as a resident of a far-flung region called the "inner Oort Cloud." Further, 2012 VP113 and Sedna may have been pulled into their odd orbits by a big, undiscovered planet.
10 March 2014, 08:00 AM ET
Researchers are developing flat, blanket-size landers that could be delivered en masse to worlds such as Mars or Jupiter's moon Europa. The approach could enable NASA to mount missions to places previously deemed too risky to explore, researchers say.
08 March 2014, 08:29 AM ET
If the skies are clear where you live on Sunday night, you'll be able to see a waxing gibbous moon shining high in the southern sky, and glowing brightly well above it will be the largest planet in our solar system: Jupiter.
07 March 2014, 12:50 PM ET
An enormous belt of carbon monoxide gas lies in the disk of debris surrounding Beta Pictoris, a young star 63 light-years from Earth. The source of the gas is probably comets, which may have been trapped there by a big alien planet.
07 March 2014, 06:47 AM ET
This series of Hubble Space Telescope photos captures a rare event in action, the breakup of asteroid P/2013 R3 as it happened in 2013 and 2014. See the amazing Hubble photos here.
07 March 2014, 06:30 AM ET
Astronomers have seen comets break apart as they near the sun, but they'd never witnessed anything similar in an asteroid in the main belt — until now. Hubble images show that the asteroid, known as P/2013 R3, has fragmented into 10 pieces.
05 March 2014, 01:00 AM ET
The White House's 2015 federal budget request, which was released Tuesday, allocates $15 million to help develop a mission to Europa, which harbors a potentially life-supporting ocean of liquid water beneath its icy shell.
03 March 2014, 02:36 PM ET
The bright stars and star clusters of the constellation Gemini are on display along with post sunset sightings of Jupiter and Mars. Saturn and Venus make early morning appearances.
24 February 2014, 12:17 PM ET
Voyager 2, arriving at Jupiter four months after Voyager 1, was actually launched 16 days before its mate.
24 February 2014, 06:30 AM ET
Probably the most eye-catching object these cold winter evenings lies well up in the southeast sky soon after dark — Jupiter. The largest planet in our solar system is spending 2014 within the constellation Gemini, the Twins.
13 February 2014, 01:07 PM ET
This space wallpaper shows Jupiter's moon Ganymede centered at 200 west longitude. This mosaic (right) served as the base map for the geologic map of Ganymede (left).
13 February 2014, 11:45 AM ET
The largest moon in the solar system has finally received its cartographic due, more than 400 years after its discovery.
13 February 2014, 11:03 AM ET
See amazing photos of Jupiter's moon Ganymede, the largest moon in the solar system in this Space.com gallery made of images from NASA's Voyager 1, 2 and Galileo spacecraft, as well as telescope images.
13 February 2014, 10:53 AM ET
Ganymede would easily be classified as a planet if were orbiting the sun rather than Jupiter.
12 February 2014, 03:41 PM ET
Surface features, such as furrows, grooves and impact craters are illustrated on this 360 degree view of the moon. The best imagery from NASA's Voyager 1 and 2 and Galileo spacecrafts were used to create it. Galileo Galilei discovered it in 1610.
12 February 2014, 06:00 AM ET
The four satellites that currently comprise the Galileo constellation — Europe's version of the United States' GPS satnav system — have passed a key test called In-Orbit Validation, European Space Agency officials announced Monday.
10 February 2014, 11:52 AM ET
If your sky is clear tonight (Feb. 10), be sure to check out the southeast sky about an hour or so after sundown for an eye-catching site: Jupiter and the moon shining together. Weather permitting, stargazers can find the celestial meet-up on about halfwa
08 February 2014, 10:13 AM ET
Skywatchers have a lot to look up for in February 2014. Weather permitting, diligent observers should be able to spot a plethora of planets, comets and stars in the night sky this month.
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.
04 February 2014, 10:10 AM ET
The brilliant planet Jupiter and constellation Orion shine brightly in this glittering night sky photo shot from the Canary Islands by astrophotographer Miguel Claro.
03 February 2014, 10:30 AM ET
What would life be like if aliens from Europa invaded Earth? A weekly comic strip from Astrobiology Magazine attempts to answer that question.
30 January 2014, 04:05 PM ET
The bright 'star' overhead after the Sun sets, in the winter of 2014, is our closest gas giant, Jupiter and the red supergiant Betelgeuse, 650X bigger than the Sun, is one of the shoulder of the 'Great Hunter' (Orion Constellation).
29 January 2014, 01:01 PM ET
Astronomers have come to realize that the asteroids in the main belt between Mars and Jupiter are incredibly diverse in size and composition, implying that they were scattered here and there by migrating planets long ago.
15 January 2014, 03:53 PM ET
In the desert here, the nearly full moon was so bright that we didn't even need a flashlight to walk to the Mars Desert Research Station Musk Observatory. The stars were still, as the dry air did not provide much humidity to cause twinkling.
10 January 2014, 09:52 AM ET
Before the Voyager spacecraft were launched in 1977, a prototype was put through vibration tests.
03 January 2014, 06:31 PM ET
The online Slooh Space Camera will webcast live views of the annual Quadrantid meteor shower on Friday (Jan. 3), Earth's closest approach to the sun of the year on Saturday (Jan. 4) and Earth's passage between the sun and Jupiter on Sunday (Jan. 5).
31 December 2013, 09:27 AM ET
A crescent Venus, Jupiter at opposition, Taurus constellation and its Red-Giant 'eye' and the Quadrantid meteor shower makes for quite a skywatching show. In the market for a telescope? - Click the blue 'SHOP' link above.
31 December 2013, 09:06 AM ET
The Gas Giant is 83 Million miles away on average. In January it will be 391 million miles away when its reaches opposition. Venus is the only object that will be brighter than Jupiter. Need a telescope? - Click the blue 'SHOP' link above.