Gravity Probe B
7 misterios del universo
El Universo está lleno de contradicciones, tantas como la naturaleza humana. Hay certezas, pero también incógnitas. Un vistazo a las noticias de última hora confirma lo predecible y extraño que puede llegar a ser. Ejemplo de certeza: los científicos rinden tributo a Albert Einstein con observaciones que confirman su teoría de la relatividad general, ese exótico concepto que aúna espacio y tiempo como una sola cosa. Un satélite lanzado en 2004, Gravity Probe B (GP?B), dotado de cuatro ultrasensibles giroscopios, acaba de demostrar en uno de los experimentos más elegantes, delicados y complejos de la física, que la Tierra, al girar, arrastra al espacio tiempo con ella, tal y como se deduce de los trabajos de Einstein. "Hay que imaginarla como si estuviera inmersa en miel. A medida que el planeta gira, la miel que está alrededor también lo hace con él. Ocurre lo mismo con el espacio-tiempo", ha comentado Francis Everett, principal investigador de la Universidad de Stanford, quien ha dedicado tres décadas de su vida a probarlo. Ejemplo de incógnita: en el mismo mes de mayo donde se ratificaba a Einstein, astrónomos de la NASA descubrían una serie de diez extraños planetas flotando en medio de la oscuridad del espacio sin ninguna estrella alrededor. Estos mundos, situados entre 10.000 y 20.000 años luz de distancia de la Tierra, tienen el tamaño de Júpiter, y representan una nueva clase de planeta, que no tiene ningún sol al que rendir tributo ni órbita a su alrededor. El equipo de David Bennet, de la Universidad de Notre Dame en South Bend (Indiana, EE UU), especula con que quizá estos mundos han sido expulsados de los sistemas planetarios, convirtiéndose en una suerte de renegados cósmicos. Su número podría ser incluso más astronómico, ¡doblando el de las estrellas de nuestra Vía Láctea!
Vivimos una época gloriosa de la observación; nunca en la historia reciente ha habido tantos telescopios terrestres, radiotelescopios y observatorios en órbita.
Gravity Probe B - News
It's taken four years for the ion thruster-propelled spacecraft to reach the asteroid and there was some uncertainty as to whether the probe had been captured by the asteroid's gravity at all. But after a long period of waiting, mission managers
By Divyesh Singh & Sunchika B Pandey | Place: Mumbai | Agency: DNA The ongoing probe against 20 people, including 17 policemen, in the Lakhan Bhaiya encounter case may hit a roadblock after the death of the only prime witness, Anil Bheda.
Un satélite lanzado en 2004, Gravity Probe B (GP?B), dotado de cuatro ultrasensibles giroscopios, acaba de demostrar en uno de los experimentos más elegantes, delicados y complejos de la física, que la Tierra, al girar, arrastra al espacio tiempo con
If an astronaut visits an asteroid, she probably won't actually be able to stand on it because there won't be enough gravity. Landing would be extremely difficult, but perhaps a spacecraft could rendezvous with an asteroid by matching its speed and let
dalla rotazione di un corpo celeste, di recente confermato sperimentalmente dalla missione Gravity Probe-B. Tecnicamente gli scienziati, per riferirsi al comportamento asimmetrico fra materia e antimateria, parlano di “rottura della simmetria CP”.
nanoscale views: Gravity Probe B
Finally, after only 45 years from conception to publication of results , Gravity Probe B has announced (dramatic pause) that Einstein's General Theory of Relativity is consistent with their data. I had mentioned GPB ("The Project that Ate Stanford") once before . It was a fascinating, complex, multidisciplinary project that, thanks to its experimental design and extraordinarily long duration, had great impact on a large number of physics, materials science, and engineering careers. Still, I think they were in a bit of a no-win scenario, particularly once it became clear that there were problems with interpreting the data. Either they support general relativity, or people just wouldn't trust the results, given how much other evidence there is out there that GR is right, at least in the relatively weak field limit.
Phys. Rev. Lett. 107, 051103 (2011): Rotation, the Equivalence Principle, and the Gravity Probe B Experiment: 
RT @: was right! We've got the prototype of the kit used to test theory of relativity Gravity Probe B - Bookshelf
Gravity Probe B, testing Einstein with orbiting gyroscopes
Gravity probe B, testing Einstein with orbiting gyroscopes
Observation of the earth and its environment, survey of missions and sensors
"Three Papers on Gravity Probe B." presented at The Sixth Marcel Grossmann Meeting ... "Gradiometry Coexperiments to the Gravity Probe B and Step Missions. ...Gyros, clocks, interferometers--, testing relativistic gravity in space
NASA's Gravity Probe B Mission is a test of two predictions of Einstein's General Theory of ... Gravity Probe B is scheduled for launch on April 1, 2002. ...Nonlinear gravitodynamics, the lense-thirring effect, a documentary introduction to current research
1 Introduction Gravity Probe B (GP-B) is an experiment designed to measure the geodetic ... The goal of the Gravity Probe B experiment is to measure these ...Helpful News Directory
Gravity Probe B: Testing Einstein's Universe
Relativity gyroscope satellite-based experiment developed by NASA and Stanford University to test two extraordinary, unverified predictions of Einstein's general theory of relativity.
NASA - Gravity Probe B: The Relativity Mission
The Gravity Probe B gyroscopes are the most perfect spheres ever made by humans. ... Artist concept of Gravity Probe B spacecraft in orbit around the Earth. ...
Gravity Probe B - Wikipedia, the free encyclopedia
Gravity Probe B (GP-B) is a satellite-based mission which launched on 20 April 2004 on a ... Gravity Probe B should measure this effect to an accuracy of one part ...
Review of Gravity Probe B
The experiment now known as Gravity Probe B (GP-B) was conceived more than 30 years ago. ... Gravity Probe B aspires to detect and measure, at the 1 percent level, ...
Gravity Probe B - MISSION STATUS
Gravity Probe B, launched 20 April 2004, is a space experiment testing two fundamental ... The paper is entitled: Gravity Probe B: Final Results of a Space ...