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March 24, 1972 - Image 3

Resource type:
Text
Publication:
The Detroit Jewish News, 1972-03-24

Disclaimer: Computer generated plain text may have errors. Read more about this.

THE DETROIT JEWISH NEWS

Tel Aviv I.J; . -Acknowl edges Rehovot's Role,
ti ming - Einstein Theory on Gravity

TEL AVIV (JTA) — Tel Aviv
University and the. Weizmann In-
stitute o# ;science in Rehovot have
agreed to share credit for i series
of, scientific , experiments, which
purportedly confirm Einstein's
theory that gravity acts in waves.
The agreement followed a con-
ciliatory meeting between the
heads of the two institutions. The
Weizmann Institute had objected
to Tel Aviv University taking sole
credit for the discovery.
The experiments were success-
fully conducted by Prof. Dror
Sadeh of Tel Aviv University's
department of physics and astro-
nomy.
Prof. Sadeh used the Weizmann
Institute's geophysics observatory

near Eilat, headed by Prof. Ari
Ben Menahem.
Tel Aviv U. announced the re-
sults on March 17, crediting Prof.
Sadeh on Monday, however, both
institutions acknowledged that
Prof. Sadeh and Prof. Ben Mena-
hem were partners in the discov-
ery.
Albert Einstein predicted in
1917 that gravity acts in waves.
The prediction was part of his
General Theory of Relativity. But

Prof. Sadeh's innovation was
to use the earth as a detector,
but because the effect of the
waves is very small, a sophis-
ticated electronic system had to
be built by the university, and
the advanced equipment at the
Weizmann Institute facility had
to be employed.
According to the announcement

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it could not be confirmed experi- the experiment proved the exist-
mentally because the waves are ence of gravitational waves which
•up to now were merely an assump-
extremely weak.
The experiments conducted by tion; that pulsars are neutron stars
Profs. Sadeh and Ben 3lenahem having high density and a high rate
made use of the 1967 discovery of rotation: and that a seismo-
of pulsars, a type of pulsating star graph on earth can serve as an
assumed to have very high density astronomical telescope which mea-
and very rapid rotation. Accord- sures, the movements of stars.
ing to Einstein's theory, such
bodies must emit gravity waves.
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Friday, March 24, 1972-3

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