The Mysterious Universe

absolute amount annihilation appears astronomy bodies cause century concept conservation conservation of mass consists continuum cosmic radiation course creation diffracted dimensions of space discuss distance earth Einstein electricity electrons emitted energy exactly existence experiment explain fall finite Fitzgerald-Lorentz contraction forces four-dimensional gravitation helium hydrogen atom imagine instance interpret J. J. Thomson kind law of causation laws of nature length light luminiferous ether magnetic mass material mathematician measured mechanical merely Michelson-Morley experiment miles a second millions of millions mind molecules moving nebulae Newton objects ordinary particles penetrating power photons physicists picture planets plate precisely principle principle of relativity probability produced proved pure mathematics radio-active radium reality refraction rest scientists seems shadows shower shows simplest soap-bubble speed of motion stars supposed surface system of waves theory of relativity things three dimensions tion wave-length wave-mechanics weight welded whole world lines