01 April 2014, 05:32 PM ET
Add the Monastery at Petra to the monuments that humans likely built for astronomical purposes. New research suggests that ancient architects tracked the motion of the sun and constructed the religious center with the winter solstice in mind.
01 April 2014, 10:18 AM ET
Calling all space cadets: Earthwatch wants volunteers to help search for life on Mars in what has to be the most entertaining April Fools' joke you'll see this year.
01 April 2014, 07:22 AM ET
Researchers studied the water content in the rocks from the lunar highlands. The analysis suggests that water in ancient lunar rocks and water on Earth may have a common origin.
01 April 2014, 07:00 AM ET
Scientists analyzed a 13th-century Latin text, applying modern mathematics to it, and found hints that the English medieval philosopher who wrote it in 1225 was already toying with concepts similar to the modern cosmological idea of a multiverse.
01 April 2014, 02:50 AM ET
The story behind a well-known image of the 1987 occultation of Venus by the moon.
01 April 2014, 02:18 AM ET
Astronomers say there are 100 billion to 200 billion galaxies in the universe. But accurately counting the number of galaxies depends on several factors.
01 April 2014, 12:41 AM ET
This colorful space wallpaper is a radar composite image shows changes in large-scale agricultural plots in southwest Iran. The image was released March 28, 2014.
31 March 2014, 03:20 PM ET
The constellations of Ursa Major (the ‘Big Dipper') and Leo hold a bevy of skywatching goodness this month. Find out how to see the 'Leo Tripet’ of galaxies, plus the double star systems of Mizor and Alcor, and more.
31 March 2014, 02:48 PM ET
Red Mars' close encounter with Earth, a 'red moon' total lunar eclipse (visible from North America) and the Lyrid meteor shower will highlight the month of April 2014. Also, the mornings and evenings will showcase Jupiter, Saturn and Venus.
31 March 2014, 02:46 PM ET
Scientists are using data gathered by NASA's twin Van Allen Probes, which launched to Earth orbit in August 2012, in concert with advanced computer models, to simulate the dynamic radiation environment of near-Earth space, two new studies report.
31 March 2014, 02:02 PM ET
On March 31st, 2014, NASA's Solar Dynamics Observatory captured an M1.4-class flare erupting from sunspot AR2014. During the flare, plasma erupted and was sucked backed into the Sun.
31 March 2014, 12:26 PM ET
The sun unleashed a major solar flare Saturday (March 29) that sparked a radio blackout on Earth. See video of the huge X1-class solar flare here.
31 March 2014, 11:57 AM ET
A close look by NASA's Chandra X-ray Observatory at the debris field of supernova explosion DEM L241 in the Large Magellanic Cloud has revealed a young star tightly orbiting either a tiny neutron star or a black hole. Read more: http://goo.gl/xT14vA
31 March 2014, 11:03 AM ET
Scott Kelly has just one year left on Earth. An experienced NASA astronaut and half of the first pair of twins to fly into space, Kelly will leave the planet in 2015 to become the first U.S. astronaut to log a year in space.
31 March 2014, 10:22 AM ET
The Stanford University physicist appeared overwhelmed after learning that a team of astronomers had more or less confirmed the theory of cosmic inflation, which Linde helped refine in the early 1980s after it was originally proposed by Alan Guth.
31 March 2014, 10:20 AM ET
An international team based at Cambridge U. has shown how the Sun’s twisting magnetic field lines slip, reconnect, tighten and snarl into a characteristic ’S’ shape. Knowing how such titanic energies build may better predict dangerous larges flares.
31 March 2014, 09:50 AM ET
Mars and Earth will only be 92 million miles apart at closest encounter in April 2014, called ‘opposition’. Mars will appear red-gold, glowing brighter than first magnitude stars. Only Jupiter, the Moon and Venus before sunrise will be brighter.
31 March 2014, 07:34 AM ET
The European Space Agency's comet-chasing Rosetta spacecraft opened its eyes in January after a 10-year voyage across the solar system and a long hibernation in deep space. For the first time since its wakeup call, Rosetta spied its destination.
31 March 2014, 05:27 AM ET
In August 2014, ESA's Rosetta Spacecraft will rendezvous with Comet 67P/Churyumov-Gerasimenko and deploy the Philae lander. See photos from the Rosetta comet probe.
30 March 2014, 10:08 PM ET
An X1-class flare erupted from sunspot AR2017 on Mar. 29th, 2014. NASA's SDO captured the fireworks and NASA's SOHO captured the resulting coronal mass ejection. A magnetic crochet rippled Earth's magnetic field when the flare was in progress.
30 March 2014, 01:45 PM ET
What was your favorite space news story of the last week?
29 March 2014, 02:36 PM ET
From rings around an asteroid to a shimmering rainbow of colors captured on camera above Venus, don't miss these amazing space images of the week for March 29, 2014.
28 March 2014, 03:18 PM ET
Twice in the past two weeks the Mars rover Opportunity has experienced "cleaning events" that have blown some of the rusty powder away, allowing more sunlight to fall on the solar arrays, giving the six-wheeled rover a seasonal power-up.
28 March 2014, 02:34 PM ET
HR 5171, the brightest star just below the center of this stunning space wallpaper, is a yellow hypergiant, a very rare type of stars with only a dozen known in our galaxy.
28 March 2014, 02:07 PM ET
The Laser Interferometer Gravitational-Wave Observatory could be as significant an innovation as the telescope. This story of passionate creative researchers striving to understand the fabric of our Universe premieres Tuesday April 15 at Space.com.
28 March 2014, 11:45 AM ET
The central black holes in dwarf galaxies — the "seeds" that grow into the monsters at the core of the Milky Way and other large galaxies — are probably surprisingly weighty, containing 1,000 to 10,000 times the mass of our sun, a new study reports.
28 March 2014, 11:15 AM ET
Host Neil deGrasse Tyson will explore the ways light, time and gravity effect our perceptions of the universe as he travels faster than the speed of light and into the depths of a black hole on the next episode of Cosmos: A Sky Full of Ghosts.
28 March 2014, 11:00 AM ET
See what's up in the night sky for April 2014, including stargazing events and the moon's phases, in this Space.com gallery courtesy of Starry Night Software.
28 March 2014, 09:29 AM ET
When a small NASA-funded rocket launched off planet Earth this month in a dazzling liftoff, it wasn't headed for the final frontier. Instead, the rocket had a closer target: the northern lights dancing over Alaska.
27 March 2014, 04:56 PM ET
See photos and images of the Mars-bound comet C/2013 A1 Siding Spring, which will buzz the Red Planet on Oct. 19, 2014. Comet Siding Spring was discovered in January 2013. Its pass through the inner solar system will be closely watched by Mars probes.
27 March 2014, 03:09 PM ET
A new Hubble image, captured on March 11, shows what appear to be two jets of dust coming off the nucleus of Comet Siding Spring, which on Oct. 19 will miss Mars by just 84,000 miles — about one-third the distance between Earth and the moon.
27 March 2014, 02:45 PM ET
A series of four lunar eclipses spaced 6 months apart will begin on April 15th, and all of the eclipses will be visible for much of the United States.