Notícies d'astronomia

New Satellite Data Reveals True Decline Of World's Mangrove Forests (anglès) - Dj, 19/08/2010 - 15:10
Reston VA (SPX) Aug 19, 2010
New satellite imagery has given scientists the most comprehensive and exact data on the distribution and decline of mangrove forests from across the world. The research, carried out by scientists from the U.S Geological Survey and NASA, is published in Global Ecology and Biogeography, and reveals forest distribution is 12.3% smaller than earlier estimates. Mangrove forests are among the mo

An Ocean Of Research Via Satellite (anglès) - Dj, 19/08/2010 - 15:10
Washington DC (SPX) Aug 19, 2010
With the Central Pacific well within reach, SES WORLD SKIES has announced that The Nature Conservancy has secured capacity on its NSS-9 satellite to link researchers studying the Palmyra reef islands with the outside world. Located 1,000 miles south of Hawaii, remote Palmyra Atoll is a National Wildlife Refuge and part of the recently-designated Pacific Remote Islands Marine National Monum

Astronaut Muscles Waste In Space (anglès) - Dj, 19/08/2010 - 15:10
Milwaukee WI (SPX) Aug 19, 2010
Astronaut muscles waste away on long space flights reducing their capacity for physical work by more than 40%, according to research published online in the Journal of Physiology. This is the equivalent of a 30- to 50-year-old crew member's muscles deteriorating to that of an 80-year-old. The destructive effects of extended weightlessness to skeletal muscle - despite in-flight exercise - p

APL-Led Team Demonstrate Space Weather Observation (anglès) - Dj, 19/08/2010 - 15:10
Laurel MD (SPX) Aug 19, 2010
The Johns Hopkins University Applied Physics Laboratory (APL), with help from Boeing and Iridium Communications, has successfully implemented a new space-based system to monitor Earth's space environment. Known as the Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE), the system provides real-time magnetic field measurements using commercial satellites as part

Eclipsing Pulsar Promises Clues To Crushed Matter (anglès) - Dj, 19/08/2010 - 15:10
Greenbelt MD (SPX) Aug 19, 2010
Astronomers using NASA's Rossi X-ray Timing Explorer (RXTE) have found the first fast X-ray pulsar to be eclipsed by its companion star. Further studies of this unique stellar system will shed light on some of the most compressed matter in the universe and test a key prediction of Einstein's relativity theory. The pulsar is a rapidly spinning neutron star - the crushed core of a massive st

ISS Reboosted And Cooling System Fully Operational (anglès) - Dj, 19/08/2010 - 15:10
Houston TX (SPX) Aug 19, 2010
The Expedition 24 crew had another light-duty day Wednesday as the Loop A cooling system reactivation continued aboard the International Space Station. The reactivation followed Monday's spacewalk, the third in a series of excursions that began Aug. 7 to remove and replace an ammonia coolant pump module that failed July 31. Power restoration to systems affected by the pump module failure i

Ping-Pong Balls To Float Crew Capsule Simulator (anglès) - Dj, 19/08/2010 - 15:10
Hampton VA (SPX) Aug 19, 2010
If ping-pong balls can float a sunken boat, they should be able to keep an uncrewed space capsule simulator from sinking. Right? That's what a team of summer students and engineers think at NASA's Langley Research Center in Hampton, Va. Langley is fabricating a proposed design of an astronaut crew module simulator for uncrewed flight-testing as part of the agency's effort to build a vehicl

Oil And Gas Exploration Benefit From Space Tech (anglès) - Dj, 19/08/2010 - 15:10
Paris, France (ESA) Aug 19, 2010
A special kind of titanium and a manufacturing technique used to build the Ariane 5 rocket could become the next successful spin-offs from Europe's space programme, benefiting the oil and gas industry. Together with space sensor technology that could be used in new offshore drilling tools, these exciting developments are the result of several technology demonstrator projects just completed

Press Release: Planetary Society Asks Congress to Refocus NASA Plan

Planetary Society (anglès) - Dj, 19/08/2010 - 09:00
On the Planetary Society web site: Planetary Society Asks Congress to Refocus NASA Plan

Sailing Amongst the Stars

Making the stuff of science fiction into reality, NASA engineers are testing solar sails--a unique propulsion technology that one day could enable deep space missions. Much like the wind pushing a sailboat through water, solar sails rely on sunlight to propel vehicles through space. The sail captures constantly streaming solar particles, called photons, with giant sails built from a lightweight material. Over time, the buildup of these particles provides enough thrust for a small spacecraft to travel in space. This image is of a four-quadrant solar sail system, measuring 66 feet on each side that is being tested in the world's largest vacuum chamber at NASA's Glenn Research Center at Plum Brook Station in Sandusky, Ohio. Image Credit: NASA

Drought Drives Decade-Long Decline in Plant Growth

Global plant productivity that once was on the rise with warming temperatures and a lengthened growing season is now on the decline because of regional drought according to a new study of NASA satellite data.

Trip to Mars could leave crew dangerously weak - study (anglès) - Dj, 19/08/2010 - 02:10
Paris (AFP) Aug 18, 2010
If a human ever sets foot on Mars, will it be a giant step or an exhausted shuffle? Long-term space flight so weakens fitness that an astronaut heading to the Red Planet may lose up to half the power in key muscles in the course of the mission, scientists have found. The loss - equivalent to a crew member aged between 30 and 50 returning home with the muscles of an 80-year-old - would

Scientist: SETI success within 25 years? (anglès) - Dj, 19/08/2010 - 02:10
Santa Clara, Calif. (UPI) Aug 16, 2010
The search for extraterrestrial intelligence could yield proof of its existence within 25 years, a U.S. scientist involved in the quest says. Speaking at the SETI Con convention in Santa Clara, Calif., Seth Shostak - senior astronomer at the Search for Extraterrestrial Intelligence Institute in Mountain View, Calif. - said, "I actually think the chances that we'll find ET are pretty g

Commentary: Guns of August? (anglès) - Dj, 19/08/2010 - 02:10
Washington (UPI) Aug 17, 2010
For the first two weeks of August, the Internet buzzed with "inside knowledge" of an Israeli airstrike against Iran's nuclear facilities before the end of the month. One of most quoted warnings came from Philip Giraldi, a polyglot former CIA operative who writes for the American Conservative and is no friend of Israel. "We spend $100 billion on intelligence annually and then ignore the

China military gaining on Taiwan, aiming beyond: US (anglès) - Dj, 19/08/2010 - 02:10
Washington (AFP) Aug 17, 2010
China is extending its military advantage over Taiwan and increasingly looking beyond, building up a force with power to strike in Asia as far afield as the US territory of Guam, the Pentagon said. In an annual report to Congress, the US Defense Department said Monday that China was ramping up investment in an array of areas including nuclear weapons, long-range missiles, submarines, aircraf

LibDem leader speaks out against Trident (anglès) - Dj, 19/08/2010 - 02:10
London (UPI) Aug 18, 2010
Liberal Democrat leader Nick Clegg has spoken out against renewing Britain's nuclear deterrent, denouncing its huge cost at a time of social benefit cuts. The renewal of the submarine-launched missile system called Trident was agreed in 2007 and is due by 2024 - at a cost of around $30 billion. Clegg, who spoke out against renewing the system while in opposition, said there was

N.Korea sought summit after warship sinking: report (anglès) - Dj, 19/08/2010 - 02:10
Seoul (AFP) Aug 19, 2010
North Korea proposed a summit with South Korea even after tensions mounted dramatically over the deadly sinking of one of Seoul's warships, a newspaper reported. The impoverished communist state made the proposal last month in an apparent bid to secure economic aid from South Korea but the idea was rejected by Seoul, the Dong-A Ilbo newspaper reported Wednesday, quoting an unnamed high-ranki

China lashes out at Pentagon military report (anglès) - Dj, 19/08/2010 - 02:10
Beijing (AFP) Aug 19, 2010
China hit out Wednesday at a Pentagon report on its expanding military capabilities as other Asian nations said they would be keeping a wary eye on their giant neighbour's growing might. Beijing said the US Defence Department report was "not beneficial" for military ties between the two powers, while state media branded the dossier "aggressive" and said it exaggerated China's military power.

Talks with US only if sanctions are dropped: Iran's Khamenei (anglès) - Dj, 19/08/2010 - 02:10
Tehran (AFP) Aug 18, 2010
Iran's supreme leader Ayatollah Ali Khamenei said on Wednesday that any talks with arch-foe the United States would take place only if Washington drops "sanctions and threats" against Tehran. In a speech on state television, the all-powerful Khamenei also blamed Washington for Iran's defiant move to enrich uranium to 20 percent, the most controversial aspect of its nuclear programme. "Th

Brazil invests heavily in IT, security (anglès) - Dj, 19/08/2010 - 02:10
Rio De Janeiro (UPI) Aug 17, 2010
Cash-rich Brazil is investing heavily in its information technology and security infrastructures as economic prosperity in key sectors demands greater protection and wider networks. Current figures suggest the Latin American giant will spend $8.9 billion this year alone, Dublin-based Research and Markets said in its report on Brazil IT for the third quarter of 2010. Brazil alread

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