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.
17 June 2015, 01:00 PM ET
By studying data from the Kepler probe, scientists have found a planet about the size of Mars, about 200 light-years away from Earth.
17 June 2015, 06:50 AM ET
From studying extreme life forms on Earth, to using Antarctica as an analogue for icy moons in our solar system, scientists have a wide range of approaches to searching for life beyond Earth.
16 June 2015, 05:26 PM ET
Is it likely that we’re not alone in the universe? And if intelligent life is out there, why haven’t they contacted us yet?
13 June 2015, 10:09 AM ET
A robot designed to tunnel through thick ice caps and penetrate subterranean seas could one day explore the underground oceans of Jupiter's moon Europa — an environment potentially habitable to life.
12 June 2015, 06:30 AM ET
The area of our solar system where Mercury resides may once have held as many as four rocky planets. Violent collisions could have left it as the last survivor.
11 June 2015, 07:14 AM ET
Fifteen-year-old Tom Wagg first spotted the Jupiter-size exoplanet two years ago. Further observations have now confirmed the existence of WASP-142b, which lies about 1,000 light-years from Earth.
09 June 2015, 06:20 AM ET
NASA officials hope the agency's flyby mission to Europa in the 2020s paves the way for future missions to the Jupiter moon — including, perhaps, one that touches down to search for signs of life.
08 June 2015, 09:37 AM ET
Though Hubble doesn’t typically discover exoplanets, it is sometimes used to determine what lies in their atmospheres. Future telescopes should be powerful enough to ‘see’ markers of life processes in the ‘air’ of Earth-sized alien world.
07 June 2015, 09:31 AM ET
From up-close looks at Saturn's "spongy" moon Hyperion to photos of the first NASA spacewalk, which occurred 50 years ago this week, don't miss these amazing space images.
05 June 2015, 11:20 AM ET
Engineers are looking to automate some of the simple decision-making steps undertaken by Mars rovers and orbiters, which could dramatically improve the science they are able to perform in the search for habitable environments.
03 June 2015, 06:09 AM ET
A new study looking at microbes that can survive in the vacuum of space demonstrates the need to consider how such microbes might contaminate environments beyond Earth.
03 June 2015, 06:06 AM ET
Hardy life-forms known as cyanobacteria convert sunlight to energy despite the fact that they often live in shadow. What can the adaptability of these microbes tell scientists about the possibility of life on Mars?
01 June 2015, 12:00 AM ET
See amazing images of the night sky and cosmos in Space.com's gallery of cosmic images posted in May 2015.
31 May 2015, 07:00 AM ET
NASA announced the science instruments for its mission to Europa, SpaceX was certified for U.S. military launches and a tiny solar-sailing spacecraft suffered a glitch in orbit. Here's a look at Space.com's top stories of the week.
30 May 2015, 11:13 AM ET
From a nebula's crimson heart to a dragon's-eye view, don't miss these amazing space images of the week for May 31, 2015.
26 May 2015, 05:02 PM ET
The Europa probe will carry supersharp cameras, a heat detector, ice-penetrating radar and a variety of other gear that will help researchers gauge the Jupiter moon's ability to support life as we know it.
26 May 2015, 07:05 AM ET
Green rust could help living organisms on Mars extract energy from their environment. Scientists are working on ways of identifying green rust on the surface of the Red Planet.
25 May 2015, 09:00 AM ET
A scientist has raised questions about the latest detection of methane on Mars, suggesting that NASA's rover could be responsible for the mysterious burp. Highly unlikely, but not impossible, says the Curiosity team.
24 May 2015, 09:01 AM ET
The U.S. Air Force's X-37B space plane launched on another mystery mission, Russia's Proton rocket failed during a satellite launch and astronomers found the most luminous galaxy in the universe. Here's a look at Space.com's top stories of the week.
23 May 2015, 07:00 AM ET
From the launch of the U.S. Air Force's X-37B space plane to new views of the odd bright spots on the dwarf planet Ceres, don't miss these amazing space images of the week for May 23, 2015.
19 May 2015, 07:00 AM ET
NASA is considering allowing a team of researchers, teachers, artists and engineers to upload an interstellar message to the agency's New Horizons spacecraft, which will perform the first-ever flyby of Pluto on July 14.
18 May 2015, 01:34 PM ET
Three boulders balancing like ballerinas have been spotted on the surface of a comet by the Rosetta spacecraft. Only a small area on the surface of each rock is touching the ground, similar to "balancing rocks" seen on Earth.
17 May 2015, 09:17 AM ET
From the coast of Japan to a dragon selfie, don't miss these amazing space images of the week for May 17, 2015.
14 May 2015, 12:47 PM ET
See amazing images of the night sky and cosmos in SPACE.com's gallery of cosmic images posted in April 2015.
14 May 2015, 07:18 AM ET
"Chaotic planets" that possess wildly unpredictable orbits and climates likely circle distant stars, suggesting that some alien worlds that look habitable might actually be hostile to life for millions of years at a time, a new study reports.
13 May 2015, 07:19 AM ET
The reddish-brown lines that crisscross the icy surface of Europa may be radiation-blasted sea salt from the Jupiter moon's underground ocean. Radiation-blasted salt turned dark during a lab experiment that mimicked Europa conditions.
13 May 2015, 07:00 AM ET
Although DNA and RNA would not function in environments like that of Saturn's moon Titan, ethers could fulfill this key role.
11 May 2015, 07:00 AM ET
The new ideas funded by the NASA Innovative Advanced Concepts (NIAC) program include a squid-like amphibious rover that could explore icy, ocean-harboring moons such as the Jupiter satellite Europa.
11 May 2015, 07:00 AM ET
A team of scientists used NASA's Wide-field Infrared Survey Explorer spacecraft to hunt for telltale heat signatures coming from 100,000 galaxies. They found no smoking guns.
10 May 2015, 09:05 AM ET
Russia's failed Progress 59 cargo spacecraft fell back to Earth, SpaceX's Dragon crew capsule launched on its first big test and the sun fired off its most powerful flare of 2015 so far. Here's a look at Space.com's top stories of the week.
09 May 2015, 10:52 AM ET
There are many unknowns regarding the potentially habitable exoplanet Kepler-186f, but it may have similar light (from its star) and gravity as Earth.