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Astronomy Picture of the Day
Gravity Probe B Confirms the Existence of Gravitomagnetism
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zorg.ch
#113169
by
[z]Barbara Harris
@
11.05.2011 00:00
- nach oben -
Gravity Probe B Confirms the Existence of Gravitomagnetism
Explanation: Does gravity have a magnetic counterpart? Spin any
electric
charge and you get a
magnetic field. Spin any mass and, according to
Einstein
, you should get a very slight effect that acts
something like magnetism
. This
effect
is expected to be so small that it is beyond practical experience and ground laboratory measurement. In a bold attempt to directly measure
gravitomagnetism
, NASA
launched
in 2004 the
smoothest spheres
ever manufactured into space to see
how they spin
. These four
sphere
s, each roughly the size of a
ping-pong
ball, are the key to the ultra-precise
gyroscopes
at the core of
Gravity Probe B
. Last week, after accounting for persistent background signals, the results were
announced
-- the
gyroscopes
precessed at a rate consistent with the gravitational predictions of Einstein's
General Theory of Relativity
. The results, which bolster
existing findings
, may have untold long term benefits as well as shorter term benefits such as
better clocks
and
global positioning
trackers.
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