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CAPE CANAVERAL, Florida (Reuters) - NASA's first telescope dispatched to hunt for Earth-like planets that may support life elsewhere in the universe has lost use of its positioning system, threatening its mission, officials said on Wednesday.

NEW YORK (Reuters) - After more than 15 years of failures by scientists around the world and one outright fraud, biologists have finally created human stem cells by the same technique that produced Dolly the cloned sheep in 1996: They transplanted genetic material from an adult cell into an egg whose own DNA had been removed.

WASHINGTON (Reuters) - The U.S. government believes a Chinese missile launch this week was the first test of a new interceptor that could be used to destroy a satellite in orbit, one U.S. defense official told Reuters on Wednesday.

NEW YORK (Reuters) - Scientists' assertion that the advance in therapeutic cloning announced on Wednesday could not and would not pave the way to cloning a baby did little to assuage critics of the research.

OSLO (Reuters) - A melt of ice on Greenland and Antarctica is likely to be less severe than expected this century, limiting sea level rise to a maximum of 69 cm (27 inches), an international study said on Tuesday.

ALMATY/CAPE CANAVERAL, Florida (Reuters) - The Canadian astronaut who became a music sensation when his zero-gravity version of David Bowie's "Space Oddity" went viral on the web returned to Earth along with two crewmates on Tuesday after a five-month stint on the International Space Station.

CAPE CANAVERAL, Florida (Reuters) - A pair of spacewalking astronauts wrapped up a hastily planned repair job on Saturday to replace a suspect coolant pump needed to keep the International Space Station at full power.

MIAMI (Reuters) - NASA plans to send two astronauts aboard the International Space Station out on a spacewalk on Saturday to try to fix an ammonia leak in a cooling system on one of the station's solar arrays, the U.S. space agency said on Friday.

WASHINGTON (Reuters) - A 70-million-year-old dinosaur skeleton from the Gobi Desert that was smuggled to the United States in pieces and auctioned for more than $1 million was returned on Monday by the U.S. government to Mongolia.

(Reuters) - The flight from San Fransisco to Phoenix took 18 hours and 18 minutes on Saturday - and didn't use a drop of fuel.

(Reuters) - The flight from San Fransisco to Phoenix took 18 hours and 18 minutes on Saturday - and didn't use a drop of fuel.

WASHINGTON (Reuters) - Boeing Co's X-51A Waverider made history this week when it achieved the longest hypersonic flight by a jet-fuel powered aircraft, flying for 3-1/2 minutes at five times the speed of sound, the U.S. Air Force said on Friday.

SAN FRANCISCO (Reuters) - A solar-powered airplane that developers hope to eventually pilot around the world took off early on Friday from San Francisco Bay on the first leg of an attempt to fly across the United States with no fuel but the sun's energy.

LONDON (Reuters) - Is nanomedicine the next big thing? A growing number of top drug companies seem to think so.

WASHINGTON (Reuters) - Nine years after he placed the first telephone call, Alexander Graham Bell tried another experiment: he recorded his voice on a wax-covered cardboard disc on April 15, 1885, and gave it an audio signature: "Hear my voice - Alexander Graham Bell."

(Reuters) - A six-passenger spaceship owned by an offshoot of Virgin Group fired its rocket engine in flight for the first time on Monday, a key step toward the start of commercial service in about a year, Virgin owner Richard Branson said.

WASHINGTON (Reuters) - Nine years after he placed the first telephone call, Alexander Graham Bell tried another experiment: he recorded his voice on a wax-covered cardboard disc on April 15, 1885, and gave it an audio signature: "Hear my voice - Alexander Graham Bell."

FRANKFURT (Reuters) - Space junk such as debris from rockets must be removed from the Earth's orbit to avoid crashes that could cost satellite operators millions of euros and knock out mobile and GPS networks, the European Space Agency said.

LONDON (Reuters) - Scientists probing the nature of antimatter have found a bit more evidence to explain why the universe is not an empty husk, although not enough to account for the billions of galaxies strewn across the cosmos.

CAPE CANAVERAL, Florida (Reuters) - A recently discovered comet, dazzlingly bright even though it is still almost as far away as Jupiter, is racing toward a November rendezvous with the sun, officials said on Tuesday.