10 March 2015, 08:30 AM ET
If a robot plunges into the ocean of an icy moon, perhaps near Saturn or Jupiter, its main problem will be figuring out what to do next. Even at light speed, it takes hours for communications to pass back and forth to Earth.
09 March 2015, 04:00 PM ET
Opportunity has paused to study some intriguing rocks just before its odometer ticks over to 26.2 miles (42.195 kilometers) — the equivalent of a marathon.
08 March 2015, 12:48 PM ET
A powerful camera spotted a comet and scientists captured images of a supernova four different times. Here are Space.com's pics for the top space stories of the week.
06 March 2015, 06:31 PM ET
The Feb. 27 short circuit that has halted some of the science work by NASA's Mars rover Curiosity, apparently originated in the robot's rock-boring drill, space agency officials announced Friday (March 6).
05 March 2015, 02:01 PM ET
Ancient Mars likely once had an ocean large enough to cover 20 percent of the Martian surface, a fifth of the planet, scientists say. But over time, most of that water was lost to space.
05 March 2015, 12:01 PM ET
About 4.5 billion years ago, the Red Planet was a much wetter place. New isotopic measurements of Mars by several ground-based telescopes on Earth reveal a new map of where the water laid and a model of water loss over time can be constructed.
04 March 2015, 06:33 PM ET
March should be a great month for spotting planets for skywatchers, weather permitting. Venus is becoming increasingly more prominent in the evening sky, remaining above the horizon for 2.5 to 3 hours after the sun dips below the horizon
04 March 2015, 07:22 AM ET
The car-size Curiosity rover suffered a "transient short circuit" on Feb. 27 while it was transferring sample powder from its robotic arm to instruments on the robot's body, NASA officials said.
03 March 2015, 02:00 PM ET
Put six people into an isolated environment for months at a time, and lots of things can happen: frustration, conflict, or at best — a tight-knit group of people working happily for a common goal.
28 February 2015, 03:32 PM ET
From a record-setting parafoil flight to a newly-tested space plane, don't miss these amazing space images of the week for March 1, 2015.
27 February 2015, 07:45 AM ET
Curiosity drilled into a rock called Telegraph Peak on Tuesday (Feb. 24), collecting sample powder for analysis by its onboard instruments. The rover has now drilled into three different rocks at the base of the towering Mount Sharp.
26 February 2015, 01:38 PM ET
Going to Mars without setting up a colony — round-trip manned missions, in other words — would not be enough for the U.S. to reclaim its leadership in space, nor would setting up human outposts on the moon, Aldrin said.
26 February 2015, 09:40 AM ET
The Gemini Twins and a dimmer Cancer constellation make their way into the night sky in March.
24 February 2015, 10:16 PM ET
One day I imagine that humanity will be able to visit other planets in the Solar System, and venture even further to other stars, but this has always seemed very far away. That’s the reason why I applied for the Mars One mission.
24 February 2015, 06:14 PM ET
The photo, which was released today (Feb. 24), is a composite of dozens of images taken in late January by Curiosity's Mars Hand Lens Imager. The mosaic provides a great view of the "Pahrump Hills" outcrop at the base of the huge Mount Sharp.
21 February 2015, 04:46 PM ET
Europe's last cargo spacecraft came down to Earth in a fiery blaze and scientists reported seeing mysterious plumes emanating from Mars. Here are Space.com's picks for the best space stories of the week.
21 February 2015, 12:42 PM ET
From mysterious plumes on Mars to a space station made of matchsticks, don't miss these amazing space images of the week for Feb. 22, 2015.
18 February 2015, 05:14 PM ET
Mars, Venus and the moon will meet up in a particularly beautiful cosmic display Friday. If you've been watching the evening twilight sky over the past few weeks, you will have seen the brilliant planet Venus gradually moving away from the sun, setting sl
18 February 2015, 02:53 PM ET
In a Mars environment, it appears even brewing may be possible.
17 February 2015, 04:00 PM ET
Mars would not be an easy home for human colonists. See how its lower gravity, thin atmosphere and lack of a magnetic field could make it challenging for a colonist in this Space.com infographic.
17 February 2015, 04:00 PM ET
Life on Mars would be full of chilly weather, large dust storms and geological sights dwarfing anything on Earth.
17 February 2015, 12:31 PM ET
A mystery is brewing on Mars: Amateur astronomers spotted enormous plumes erupting off the Red Planet's surface, leaving scientists puzzled.
17 February 2015, 07:50 AM ET
A new study of emissions from Martian volcanoes suggests there is no activity going on right now, but researchers aren't ruling out recent eruptions.
16 February 2015, 02:28 PM ET
Mars One, which aims to land four pioneers on the Red Planet in 2025 as the vanguard of a permanent colony, has whittled its pool of astronaut candidates down to 100, organization representatives announced Monday.
13 February 2015, 07:37 AM ET
Would you die on Mars? The Guardian interviewed three people that want to do just that as part of Mars One — a privately funded one-way mission to Mars planned to launch in the 2020s.
11 February 2015, 03:30 PM ET
Opportunity has now covered 26.094 miles (41.994 kilometers) since touching down on Mars in January 2004, leaving the rover just 660 feet (200 meters) shy of the marathon milestone, NASA officials said today (Feb. 10).
11 February 2015, 01:08 PM ET
On March 18th, 1965, Alexey Leonov stepped out of his Voskhod 2 spacecraft to become the first man to complete an extra vehicular activity (EVA) in space.
11 February 2015, 07:00 AM ET
The search for life on Mars presents us with many challenges – not the least of which is microbial contamination. How do we ensure that microbes from Earth don't hitchhike all the way to the Red Planet and spread there?
10 February 2015, 03:36 PM ET
Elon Musk insists that Mars is a “long-term insurance policy” for “the light of consciousness” in the face of climate change, extinction events, and our recklessness with technology.
10 February 2015, 02:00 PM ET
In this dreamy observation, staring down on Mars' south polar icecap, a European spacecraft has captured stunning ruddy swirls frozen in Martian ice, like cinnamon sprinkles and coffee mixing with the frothy milk atop a rich cappuccino.
09 February 2015, 07:11 AM ET
A NASA rover on Mars is getting another taste of an ancient Martian mountain. The space agency's Curiosity Mars rover arrived at Mount Sharp in Gale Crater about five months ago, and since then, the 1-ton robot has drilled two samples from the tall mounta
06 February 2015, 08:44 PM ET
The icy moon Europa is perhaps the most tantalising destination in our solar system.
06 February 2015, 07:00 AM ET
All seven crewmembers, who will spend two weeks at the Mars Desert Research Station near the Utah town of Hanksville, are astronaut candidates for Mars One's Red Planet colonization effort.
05 February 2015, 04:25 PM ET
Jupiter will dazzle all night long for the entire month, and if you’re awake in the early morning hours, look for the ringed wonder, Saturn. Skywatchers will also have good opportunuties to see Mercury, Venus and Mars this month.
02 February 2015, 06:00 PM ET
Neither Opportunity nor NASA's Lunar Reconnaissance Orbiter is allocated any funds in the White House's fiscal year 2016 budget request. But that doesn't mean the missions will definitely cease operations.
30 January 2015, 07:20 AM ET
Scientists on the Curiosity team have brought into question a recent report about potential trace fossils in the Mars rover's images of the Gillespie rock outcrop.