30 July 2015, 06:15 PM ET
The alien planet, called HD 219134b, is about 4.5 times more massive than Earth, making it a so-called "super Earth." HD 219134b lies extremely close to its host star, completing one orbit every three days, so its surface is too hot to harbor life.
30 July 2015, 07:09 AM ET
Life may have thrived in the oceans and lakes that once covered Mars — but some organisms may have survived long after the water dried up. Could scientists still find evidence of these last life-forms on Mars?
27 July 2015, 07:00 AM ET
NASA's planet-hunting Kepler space telescope continues to zero in on the first "alien Earth" despite being hobbled by a glitch more than two years ago. The mission's huge dataset should keep researchers busy for decades, team members say.
26 July 2015, 06:00 AM ET
Planet like an older Earth is found, Stephen Hawking signs on to an ambitious search for extraterrestrial life and a faulty strut is proposed as the cause of SpaceX's rocket explosion in Space.com's top news stories of the week.
24 July 2015, 04:00 PM ET
The Slooh Community Observatory will host a webcast Saturday (July 25) at 8 p.m. EDT (0000 GMT Sunday) to discuss the discovery of Kepler-452b, which NASA officials say is the most Earth-like exoplanet yet found.
24 July 2015, 06:00 AM ET
A group of pioneers magically transported to the surface of Kepler-452b would instantly realize they weren't on their home planet anymore; they'd feel this truth in their bones and muscles, thanks to the increased surface gravity.
23 July 2015, 02:43 PM ET
Astronomers have announced the discovery of planet Kepler-452b, orbiting a star very much like the sun but older and hotter.
23 July 2015, 12:00 PM ET
NASA's planet-hunting Kepler space telescope has spotted more than 500 new potential alien planets, including an Earth-like planet amid a dozen that may be capable of supporting life.
23 July 2015, 08:00 AM ET
In a new teleconference at 12 p.m. EDT (1600 GMT) Thursday (July 23), NASA will unveil a potentially exciting discovery regarding the search for alien planets by the Kepler Space Telescope.
21 July 2015, 02:10 AM ET
Famed physicist Stephen Hawking helped launch a major new search for intelligent alien life, despite having strong fears that such creatures would destroy humanity.
20 July 2015, 12:13 PM ET
A new $100 million, 10-year search for intelligent life in the universe was announced today (July 20) by famed scientist Stephen Hawking and other prominent researchers.
19 July 2015, 03:42 AM ET
NASA's New Horizons probe dominated the news cycle this week, after making a successful close encounter with Pluto, and sending back incredible images and data. Plus, an astronaut mining company launched a tech-testing satellite.
19 July 2015, 03:19 AM ET
Gorgeous views of Pluto and its ice mountains, its largest moon Charon to the release of Plutos USPS stamp, don't miss these amazing space images.
17 July 2015, 09:35 PM ET
Life in a binary system might not be as magic as it seems in the movies.
12 July 2015, 02:47 AM ET
NASA's New Horizons probe captured amazing images of Pluto, scientists revealed details about a proposed superpowerful space telescope and NASA announced its first four commercial-crew astronauts. Here are Space.com's top stories of the week.
11 July 2015, 01:16 AM ET
From gorgeous views of Pluto and its largest moon Charon to an amazing shot of the International Space Station crossing the moon's face, don't miss these amazing space images.
10 July 2015, 05:00 AM ET
The building blocks to create another Earth are found at solar systems across our Milky Way Galaxy, a new study reveals.
10 July 2015, 04:45 AM ET
In recent years, planetary scientists have begun to suggest that Pluto and its moons might serve as an analogue to planets orbiting double star systems — like the fictional planet Tatooine, home of Luke Skywalker.
09 July 2015, 07:00 AM ET
Scientists have discovered a number of alien solar systems much older than our own. If any such ancient worlds host life, it would have had a long time to evolve.
08 July 2015, 07:00 AM ET
A major new telescope proposed for launch in the 2030s would focus on the search for life on other planets and view the universe with 25 times higher resolution than the Hubble Space Telescope.
07 July 2015, 07:30 AM ET
Mars may appear to be dry and desolate, but the Red Planet can be surprisingly humid — perhaps humid enough to support life, some scientists say.
03 July 2015, 08:45 AM ET
Bill Borucki — who came up with the idea for the Kepler Space Telescope in the early 1980s and continued championing the concept through four failed proposals until the mission was finally approved in 2000 — is stepping down from NASA today (July 3).
02 July 2015, 07:00 AM ET
After "sleeping" for 26 years, a black hole's activity lit up astronomical observatories on June 15,and it's still going on today.
02 July 2015, 12:52 AM ET
We already knew about Venus. We had our suspicions about Mars. Now we’re sure.
01 July 2015, 12:00 AM ET
See amazing images of the night sky and cosmos in Space.com's gallery of cosmic images posted in June 2015.
30 June 2015, 01:01 PM ET
The European Space Agency’s ExoMars Rover will drill up to 2 meters (6 ft. 7 in.) into the surface; previous missions have only penetrated 5 centimeters (2 in.).
29 June 2015, 07:30 AM ET
Huge "super-Jupiter" exoplanets could sport water-rich, potentially habitable moons up to a few times more massive than Mars, a new study suggests.
28 June 2015, 10:55 AM ET
From the best-ever looks at Pluto and its largest moon Charon to gorgeous views of a supercharged northern lights display, don't miss these amazing space images.
26 June 2015, 12:09 PM ET
Barren wastelands are not as barren as they first appear.
25 June 2015, 07:00 AM ET
The extreme environments of Earth could serve as a time machine to Mars' past, showing us how microbial life could have coped with the changes on the red planet.
24 June 2015, 05:00 PM ET
On the surface of Mars, researchers have identified deposits of impact glass created in meteorite collisions, which could potentially hold signatures of life.
23 June 2015, 07:00 AM ET
NASA hopes to send robotic submarines into Europa's subsurface ocean someday, and researchers are currently testing out some prototypes in Antarctica.
21 June 2015, 11:44 AM ET
From a breathtaking view of Saturn's Dione to the 'Spit of Satan,' check out these amazing space images.
21 June 2015, 11:33 AM ET
Crashed comet lander Philae phones home. A dead satellite falls to Earth. Mars shows both methane-laced meteorites and a possibly icy past, and the moon's dust gets a source in the best of this week's space news.
17 June 2015, 01:01 PM ET
A Mars-size planet about 200 light-years from our solar system has turned out to be the lightest known alien world orbiting a normal star, researchers say. It is the first exoplanet smaller than Earth with both its mass and size measured.