Un satellite pour vérifier deux prédictions de la RG
Publié : 03 avr. 2004, 13:15
http://story.news.yahoo.com/news?tmpl=s ... _satellite :
>The unmanned, Earth-orbiting satellite is designed to test two of
>Einstein's predictions about the nature of space and time, and how the
>Earth and other bodies warp and twist the fabric that combines the two.
>...
>He proposed in 1916 that space and time form a structure that can be
>curved by the presence of a body, like the Earth, warping it like the
>dimple created by the heft of bowling ball resting on a soft mattress.
>That distortion accounts for gravity.
>
>Two years later, others suggested that the rotation of such a mass
>should drag space-time with it, twisting the structure of the fabric.
>
>If theory holds, the mass and rotation of the Earth, 397 miles below the
>probe, should throw the alignment of the spinning balls off kilter in
>subtle but measurable ways.
>
>The warping effect has been measured before. The twisting effect,
>called frame-dragging, has never been directly detected. Gravity Probe
>B aims to detect both.
>The unmanned, Earth-orbiting satellite is designed to test two of
>Einstein's predictions about the nature of space and time, and how the
>Earth and other bodies warp and twist the fabric that combines the two.
>...
>He proposed in 1916 that space and time form a structure that can be
>curved by the presence of a body, like the Earth, warping it like the
>dimple created by the heft of bowling ball resting on a soft mattress.
>That distortion accounts for gravity.
>
>Two years later, others suggested that the rotation of such a mass
>should drag space-time with it, twisting the structure of the fabric.
>
>If theory holds, the mass and rotation of the Earth, 397 miles below the
>probe, should throw the alignment of the spinning balls off kilter in
>subtle but measurable ways.
>
>The warping effect has been measured before. The twisting effect,
>called frame-dragging, has never been directly detected. Gravity Probe
>B aims to detect both.