20 August 2015, 05:01 PM ET
Astronomers have discovered thousands of extrasolar planets. Researchers hope to find a habitable planet someday.
20 August 2015, 07:25 AM ET
The Missile Defense Agency hopes to draft a preliminary design for a new kill vehicle by the end of the year.
20 August 2015, 07:01 AM ET
The 28-mile-wide (45 kilometers) Jezero Crater emerged as the frontrunner among 30 or so potential locales during the second landing-site workshop for NASA's 2020 Mars rover mission.
17 August 2015, 07:20 AM ET
A tilted orbit and a thick atmosphere could help a distant super-Earth hold onto oceans of water, making it a possible location for life to evolve.
16 August 2015, 09:40 AM ET
The discovery of a baby Jupiter could be an important step in rewriting the book on planet formation.
16 August 2015, 09:00 AM ET
NASA astronauts eat space-grown lettuce for the first time, and burying people on the moon gets easier — here are Space.com's best space stories of the week.
15 August 2015, 07:00 AM ET
From the magnificent Milky Way to a tribute to Leonard Nimoy, don't miss these stunning space images.
13 August 2015, 02:01 PM ET
Astronomers have detected the smallest alien planet yet to be directly photographed by a telescope on Earth, a methane-shrouded gas giant much like a young Jupiter. The planet 51 Eridani b orbits a star 96 light-years from Earth and resembles a young Jupi
13 August 2015, 02:00 PM ET
12 August 2015, 06:57 AM ET
The chief goal of the meeting was to start refining the mission's planned science operations, with a particular emphasis on how its nine instruments will work together to investigate Europa's habitability, agency officials said.
11 August 2015, 03:46 PM ET
More than 6,000 'Star Trek' fans are now part of a giant online tribute to Leonard Nimoy, who played the Vulcan alien Spock on the famed series.
10 August 2015, 06:16 AM ET
Some scientists theorize that our universe is fake, and we are all living in an alien simulation. Do you think all of human existence is merely an epic computer simulation?
08 August 2015, 08:58 AM ET
From an incredible photo of the moon crossing Earth's face to a new view of the dwarf planet Cere's mysterious bright spots, don't miss these amazing space images.
07 August 2015, 10:56 PM ET
Astronomers found the most far-flung galaxy ever discovered, NASA's Curiosity rover celebrated three years on Mars and Europe's Rosetta mission marked one year in orbit around a comet. Here are Space.com's top stories of the week.
06 August 2015, 07:00 AM ET
Here's a rundown of the six exoplanets NASA regards as the most Earth-like alien worlds discovered to date.
05 August 2015, 04:15 PM ET
See amazing images of the night sky and cosmos in Space.com's gallery of cosmic images posted in July 2015.
03 August 2015, 06:38 AM ET
Signs life on planets outside our solar system could be found in exoplanet atmospheres, but possible "false positives" are making scientists cautious.
31 July 2015, 06:55 PM ET
From an amazing view of Africa from space to a tint galaxy bursting with stars, don't miss these stunning space images.
31 July 2015, 06:00 AM ET
Scientists with the SETI (Search for Extraterrestrial Intelligence) Institute have already begun targeting Earth's older cousin, Kepler 452b, the first near-Earth sized world found in the habitable zone of a sun-like star.
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, 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.