Slingshot test for general relativity Apr 4, 2001 Physicists are
hoping to make a new test of Einstein's General Theory of
Relativity by measuring the effect of the Sun's gravity on a
passing spacecraft. James Longuski of Purdue University and
colleagues have devised a new formula to calculate the
distortion of space from the deflection of a spacecraft's path
as it skims the Sun (J M Longuski et al 2001 Phys. Rev. Lett. 86
2942). The researchers are optimistic that imminent refinements
in measurement technology will allow them to carry out the most
sensitive test of the theory yet. In 1915, Einstein proposed
that gravity actually distorts the fabric of space. His
calculations perfectly explained certain astronomical
observations that Newtonian physics could not account for - such
as the apparently exaggerated precession of Mercury's orbit.
"General relativity is at the heart of everything in cosmology",
says team member Ephraim Fischbach, "so it's very important we
continue to test it to make sure its predict