How did the British scientist prove Einstein's theory of relativity?

Answer 1

-- subatomic particles traveling at large fractions of lightspeed exhibit increased lifetime

and increased mass; these effects, and their magnitudes, are accurately predicted by the

math of relativity

-- atomic clocks, arriving back at their starting point after being carried around the world

in aircraft, are found to be slow; this effect, and its magnitude, are accurately predicted

by the math of relativity

-- Newtonian mechanics predicts a magnitude for the precession of the nodes of Mercury's

orbit that is wrong; the observed rate of precession agrees precisely with the math of relativity

-- the light of a distant star is bent when it passes close to the rim of the sun; this effect, and

the amount of bending, are accurately predicted by relativity

Every experiment that's been concocted to test any of the weird predictions of relativity

over nearly the past century has produced results that support the theories.