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发信人: murjun (萧牧), 信区: Aero
标 题: USA将发射引力探测器B以验证EINSTEIN时空扭曲理论en
发信站: 哈工大紫丁香 (2003年10月23日20:09:50 星期四), 站内信件
Gravity Probe B To Test Einstein's Theory of Relativity
10.21.03
NASA's spacecraft, Gravity Probe B is scheduled to launch from Vandenberg AFB
aboard a Boeing Delta II rocket December 6, 2003. The GP-B mission is
expected to be approximately 16 months long and its objective is to test
Einstein's unverified theory of relativity that states space and time are
very slightly distorted by the presence of massive objects.
To accomplish this, the mission will measure two factors, how space and time
are warped by the presence of the Earth, and how the Earth's rotation drags
space-time around with it.
Einstein's General Theory of Relativity, published in 1916, proposed that
matter causes space to curve.
The method that took years of intense research to develop will check very
precisely, the expected tiny changes in the direction of the spin axis of
four gyroscopes contained in the GP-B Space Vehicle as it orbits a 400-mile
altitude directly over the poles. The gyroscopes, free from disturbance, will
provide an almost perfect space-time reference system.
The gyroscope, first invented in 1852 by the French physicist J.B.L.
Foucault, was an instrument for studying the Earth's rotation by means of a
freely suspended flywheel. Over one hundred years of improvements have made
it the defining element in the GP-B satellite.
Gravity Probe B is NASA's most thoroughly researched program since the
beginning of space exploration. A whole range of new technologies have been
invented by physicists and engineers to produce the fine-tuned instruments
that make up the GP-B Space Vehicle. Some of the technologies developed for
this spacecraft are already being used for other science and engineering
projects.
The GP-B satellite will perform experiments that probe the very foundations
of space time.
So far the question remains, will Einstein's unverified theories be confirmed
by Gravity Probe B and Newton's theories be negated? Or will finding more
about the space-time continuum provide us with more questions than answers?
More will be revealed after GP-B has transmited its invaluable information to
us in the next year.
For further information please visit: http://einstein.stanford.edu/
--
我非常喜欢在有风有雨的季节计划自己;
有风有雨后的季节晒着阳光我昏昏睡去;
睡去的我依然在甜梦中将曾有过的温习;
温习昨天前天等等的种种激情与过去。
Jim Mural
※ 来源:·哈工大紫丁香 bbs.hit.edu.cn·[FROM: 218.8.84.199]
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