BAND


sexta-feira, 22 de janeiro de 2016

NASA WEB- NASA JPL latest news release NASA's LISA Pathfinder Thrusters Operated Successfully

GLOBE NEWS · UKRAINE NEWS-Kyiv Post Exclusive-Ukraine to continue buying all gas from Europe in near term

GLOBE NEWS ·NEW ZEALAND NEWS-HERALD -Family rift over Jonah Lomu's grave

GLOBE NEWS ·BRASIL NEWS-G1- O MELHOR DA NOTICIA ESTA AQUI


GLOBE NEWS ·ARAB NEWS-Children among dead as two more refugee boats sink

GLOBE NEWS ·ALERT-URGENT-ARAB NEWS-Cairo bomb kills 6 cops

GLOBE NEWS ·HONG KONG-90pc of Hong Kong schools may be exempted from controversial test, but parents still worried

GLOBE NEWS ·PORTUGAL NEWS-SAPO-O que aproxima e afasta os principais candidatos às presidenciais

GLOBE NEWS WEB- ·Pieniadze.gazeta.pl - oszczędzanie, startupy, biznes, ludzie, firmy

GLOBE NEWS WEB-· OGLOBO -O FIM DO PT ESTA PROXÍMO-BRASIL PT reage a pedido do PSDB para extinção da legenda

GLOBE NEWS WEB-CBS NEWS-East Coast prepares as massive blizzard looms

GLOBE NEWS · AUSTRALIAN NEWS-BODY OF EVIDENCE: What happened to Bin Laden’s corpse?

GLOBE NEWS ·GERMANY NEWS-Reaktion auf de Maizière Polizeigewerkschaft hält längere Grenzkontrollen für unmöglich

GLOBE NEWS ·ESPAÑA NEWS-EL PAÍS-Rajoy se resigna a la investidura sin votos suficientes para ganar


GLOBE NEWS ·GAZETA POLSKA-Szef MON Francji: IS w odwrocie. Koalicja zabiła już ok. 22 tys. dżihadystów

GLOBE NEWS · POLSKA ECONOMY-Najnowsze Ludzie Zakupy Praca Firmy Liczby Wideo Raporty PITy Rankingi finansowe Kodeks Karny Pieniadze.gazeta.pl - oszczędzanie, startupy, biznes, ludzie, firmy

GLOBE NEWS ·FINANCIAL TIMES-Japan joins global recovery as oil rebounds


GLOBE NEWS · THE WALL STREET JOURNAL-New Questions on Iran Prisoner Swap

GLOBE NEWS ·VIETNAM NEWS-12th National Party Congress opens

GLOBE NEWS ·JAPAN TODAY-TPP deal to be formally signed in New Zealand on Feb 4

NASA WEB-CubeSat proximity operations: The natural evolution of defensive space control into a deterrence initiative

GLOBE NEWS ENGLAND SUNDAY TIMES-Five star Broad cuts South Africa down


NASA JPL latest news release
NASA's LISA Pathfinder Thrusters Operated SuccessfullyWhile some technologies were created to make spacecraft move billions of miles, the Disturbance Reduction System has the opposite goal: To keep a spacecraft as still as possible.
The thruster system, managed by NASA's Jet Propulsion Laboratory, Pasadena, California, is part of the European Space Agency's LISA Pathfinder spacecraft, which launched from Kourou, French Guiana on Dec. 3, 2015 GMT (Dec. 2 PST). LISA Pathfinder will test technologies that could one day allow detection of gravitational waves, whose effects are so miniscule that a spacecraft would need to remain extremely steady to detect them. Observing gravitational waves would be a huge step forward in our understanding of the evolution of the universe.
Now, LISA Pathfinder is on its way to Lagrange Point L1, about 930,000 miles (1.5 million kilometers) from Earth in the direction of the sun. L1 is a special point that a spacecraft can orbit while maintaining a nearly constant distance to Earth. This month, scientists and engineers have been switching on LISA Pathfinder's instruments to test them in space. This has included the Disturbance Reduction System instrument computer and thrusters.
The system uses colloid micronewton thrusters, which operate by applying an electric charge to small droplets of liquid and accelerating them through an electric field, to precisely control the position of the spacecraft. Thrusters that work this way had never been successfully operated in space before LISA Pathfinder launched.
As of Jan. 10, all eight identical thrusters, developed by Busek Co., Natick, Massachusetts, with technical support from JPL, passed their functional tests. The thrusters achieved their maximum thrust of 30 micronewtons, equivalent to the weight of a mosquito. This level of precision is necessary to counteract small forces on the spacecraft such as the pressure of sunlight, with the result that the spacecraft and the instruments inside are in near-perfect free-fall. A mission to detect gravitational waves would need that level of stability.
"We reached a major milestone with this technology development," said Phil Barela, Disturbance Reduction System project manager at JPL. "The DRS is helping point the way to a system that could be used to detect gravitational waves in the future."
Gravitational waves are one of the last unverified predictions from the theory of General Relativity, which Albert Einstein published about a century ago. Einstein wrote that as massive bodies accelerate, such as black holes, they produce distortions in space-time. Scientists are interested in observing and characterizing these ripples in space-time so that they can learn more about the astrophysical systems that produce them, and about gravity itself. Proposed experiments to detect them from space, such as a future LISA mission, would need to measure how two freely-falling objects move ever so slightly, relative to each other, as a result of gravitational waves. In order to rule out any disturbances that could mask these waves, there must be a system to compensate for solar pressure and other factors. The Disturbance Reduction System on LISA Pathfinder will demonstrate this technology.
The Disturbance Reduction System could also lead to advanced thruster systems for other space applications. Space telescopes need to be very stable to detect distant planets in other solar systems, for example, and could use a similar system. A set of thrusters like the Disturbance Reduction System's could also be used in small satellites to help synchronize flying patterns.
LISA Pathfinder will reach its final orbit on Jan. 22, and begin science operations on March 1. For the first phase of the mission's science operations, a thruster technology system designed by the European Space Agency will be used. JPL's Disturbance Reduction System will then take over in June or July, operating for 90 days.
LISA Pathfinder is managed by the European Space Agency. The spacecraft was built by Airbus Defence and Space, Ltd., United Kingdom. Airbus Defence and Space, GmbH, Germany, is the payload architect for the LISA Technology Package. The DRS is managed by JPL. The California Institute of Technology manages JPL for NASA.

Nenhum comentário:

Postar um comentário