ATK test fires five-segment booster in Utah

ATK Aerospace Systems successfully test fires a five-segment solid-fuel booster near Promontory, Utah, as part of the Constellation moon program the Obama administration wants to cancel. Read More...

$2 billion space station particle detector delivered to Kennedy Space Center

A $2 billion physics experiment bound for the International Space Station was delivered to the Kennedy Space Center Thursday after a busy summer of work to replace the magnet at the heart of the powerful particle detector. Read More...

NASA spacecraft finds multi-planet solar system

NASA's Kepler spacecraft has found its first confirmed multi-planet solar system, including two Saturn-class worlds and a possible low-mass planet just slightly larger than Earth. The announcement follows a European discovery, using a different technique, of a solar system with up to seven planets. Read More...

Multi-planet solar system may include near Earth-size world

Astronomers discover a solar system 127 light years away with up to seven planets, including one world just a bit larger than Earth. If confirmed, this would be the least massive extra-solar planet yet found. Read More...

On Mars, satisfaction awaits Curiosity rover

NASA's $2.4 billion Mars Science Laboratory rover -- Curiosity -- is the most sophisticated unmanned lander ever built, a robot scientists hope will revolutionize humanity's understanding of the red planet (CNET repost). Read More...

How the Curiosity rover will land on Mars

In a high-speed computer-orchestrated descent jokingly referred to as "six minutes of terror," NASA's newest Mars rover will rely on a rocket-powered "sky crane" to lower the car-size robot to the surface (CNET repost). Read More...

The Mars science gear on Curiosity

Loaded with sophisticated instruments and a nuclear power pack immune to sunlight-dimming dust, NASA's Curiosity rover will search for carbon compounds and geologic clues about the habitability of the red planet (CNET repost). Read More...

NASA considering June 28, 2011, for possible rescue/resupply shuttle flight

If NASA wins political approval for one additional space shuttle mission, the agency is protectively considering a June 28, 2011, target launch date. Read More...

Station coolant loop back on line; astronauts discuss repair work

The International Space Station's coolant system is back up and running normally after a three-spacewalk repair job. The lab's U.S. astronauts discussed the repair work in an interview with CBS News. Read More...

Study suggests astronauts need better exercise

A new study shows that astronauts on long-duration spaceflights experience significant muscle wasting and a surprising loss of force, suggesting new exercise techniques are needed to keep crews fit. Read More...

Astronauts wrap up successful repair EVA (UPDATED)

Astronauts Douglas Wheelock and Tracy Caldwell Dyson wrap up a seven-hour 20-minute spacewalk to install a replacement coolant pump aboard the International Space Station. Read More...

Realtime Coverage of U.S. EVA-17

Realtime coverage of U.S. EVA-17 (loop A ammonia pump R & R part 3) Read More...

Astronauts cleared for third coolant system repair EVA

Astronauts Douglas Wheelock and Tracy Caldwell Dyson prepare for a third spacewalk Monday to install a replacement ammonia pump in a bid to complete coolant system repairs. Read More...

Advanced EHF comsat launched

A United Launch Alliance Atlas 5 rocket boosted the first Advanced Extremely High Frequency military comsat into orbit Saturday. Read More...

Third coolant repair EVA on tap Monday; fourth EVA likely

NASA delays third coolant repair spacewalk to Monday; officials say fourth spacewalk likely to tie up loose ends and move faulty ammonia pump to more secure stowage location. Read More...

Realtime Coverage of U.S. EVA-16

Realtime coverage of U.S. EVA-16 (loop A ammonia pump R & R part 2) Read More...

Astronauts cleared for second ISS repair spacewalk

NASA managers have approved plans for a second spacewalk Wednesday to isolate a leaking ammonia line, allowing astronauts to remove a faulty pump module crippling the lab's coolant system. A third spacewalk will be needed Sunday to complete the repair. Read More...

NASA revises plan for second ISS repair spacewalk

NASA planners are revising plans for a second ISS coolant system repair spacewalk Wednesday to deal with an unexpected ammonia leak. A third spacewalk is expected Sunday, pending management approval, to finish the job. Read More...

Ammonia leak, jammed connector derail coolant repair spacewalk

An unexpected ammonia leak and a jammed quick-disconnect fitting derailed plans to swap out a faulty pump module aboard the International Space Station during a spacewalk Saturday. Read More...

Realtime Coverage of U.S. EVA-15

Realtime coverage of U.S. EVA-15 (loop A ammonia pump R & R part 1) Read More...

Astronauts set for pump replacement spacewalk

Astronauts Douglas Wheelock and Tracy Caldwell Dyson make final preparations for a spacewalk Saturday to replace a coolant pump on the International Space Station. Read More...

NASA looks for source of debris found in ET feedline

Engineers are looking into how a metal washer made it into an external tank liquid oxygen feedline. Read More...

Spacewalks delayed to Saturday, Wednesday

NASA managers decided Thursday to delay two upcoming space station coolant system repair spacewalks to improve planning and procedures. The EVAs now are targeted for Saturday and Wednesday. Read More...

Preliminary timeline for pump replacement spacewalk (EVA-1)

Here is a preliminary timeline for a planned spacewalk Friday to replace a failed ammonia pump module in the International Space Station's cooling system. Read More...

NASA refines spacewalk plans for cooling pump changeout (UPDATED)

NASA astronauts and engineers are refining plans for two spacewalks to replace a large ammonia pump module that shut down Saturday, knocking out one of the lab's two cooling loops. Read More...