Stories by SPACE.com

The $2.5-billion robot has performed its first contact-science operations

New information from NASA's MESSENGER probe suggests that the mysterious innermost planet is much more similar to certain meteorites than to other planets in the solar system

The retired Endeavour is the third of four shuttles to be delivered to museums this year

The mission will be the first of twelve contracted supply deliveries by SpaceX's Dragon spacecraft

Sunita Williams ran, biked and "swam" with California triathletes to combat the muscle degeneration that comes with weightlessness

The crowd-funded project carries experiments designed by students across the globe

The raw materials for high-energy reactions are difficult and expensive to make, but production may be feasible in 50 years

A fireball was recorded entering the gas giant's atmosphere on September 10, reminiscent of the scarring impact of Comet Shoemaker-Levy 9 there in 1994

Similarities in the upper atmospheres of the three planets may be due to meteoroids' shedding heavy elements as they pass through

Decades after Apollo 13, NASA engineers and astronauts can still improvise solutions for sticky situations in space

As we come to the peak of the sun's activity cycle, scientists expect more dazzling, but possibly disruptive, displays

A new study indicates that stellar explosions can involve many different kinds of stars

NASA's next low-budget planetary mission will land a probe on Mars in 2016 to investigate the Red Planet's inner workings

The six-wheeled robot is carrying 10 science instruments—and a wealth of high-tech camera gear

The lack of even one openly gay or lesbian living astronaut in the history of American spaceflight may reflect the culture at the NASA astronaut office

Gliese 581 g shot to the top of a list put out by researchers at the University of Puerto Rico at Arecibo’s Planetary Habitability Laboratory (PHL) after a new study marshaled support for its long-debated existence

The finding could be put to use at a new facility opening in 2020 that might create new elements—that is, nuclei with more than 118 protons—in addition to new isotopes of the known elements

The same lab that first reported the shocking results last year, which could have upended modern physics, now reports that neutrinos "respect the cosmic speed limit"

To celebrate the last transit of Venus in the 21st century, astronomers and skywatchers came together in many sites around the world

Tarter is shifting into a full-time fund-raising role for the SETI Institute, which had to shut down a set of alien-hunting radio telescopes for more than seven months last year due to budget shortfalls

The company's Falcon 9 liftoff this morning represents the potential of a new era in U.S. spaceflight, the White House science adviser says

Science fiction writers will always, by definition, be one step ahead of engineers, and interstellar travel and time travel still elude them

This is the first widely visible "ring of fire" solar eclipse in the U.S. in nearly 18 years

Scientists are shocked to find that a giant shock wave long suspected of existing in front of the sun is not there