Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..46l..15h&link_type=abstract
Astrophysics and Space Science, vol. 46, Feb. 1977, p. L15-L18.
Astronomy and Astrophysics
Astrophysics
Astronomical Models, Big Bang Cosmology, Dimensionless Numbers, Dirac Equation, Viking Mars Program, Astrophysics, Constants, Earth-Mars Trajectories, Microwave Interferometers, Steady State
Scientific paper
It is shown that Dirac's (1937) Large Numbers hypothesis can be tested conclusively by using microwave-transponder VLBI techniques in the earth-Mars system. The Large Numbers hypothesis is reviewed, and the asymptotic average value of the expansion rate in the earth-Mars system is determined as 46 m per decade, a level well within the detection capabilities of current microwave ranging to Mars. The significance of conclusively testing Dirac's hypothesis with x = 1 is discussed, noting that a positive result would confirm a temporal variation of the Newtonian gravitational constant consistent with Dirac's relation as well as the validity of evolutionary cosmology. It is concluded that ranging data from both Viking landers over two Martian orbits should provide an important preliminary test of Dirac's hypothesis.
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