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3K radio energy acceleration Albert Einstein apparent astronaut astronomers atomic clocks Big Bang Big Crunch black hole blueshift cent centre collapse cosmic create curvature of space curved space deflection detect direction distance doppler effect Earth effects of gravity Einstein's theory Einstein's universe einsteinian electric electrons empty space energy of motion equivalent ergy expanding experiment exploding falling faster than light force frequency gamma factor going gravitational redshift gravity waves high speed hydrogen ideas laser beam light-bubble light-years look mass massive body massive object matter measure miles Milky million Moon moving nature Newton nuclear orbit particles of light physicists physics planet precisely predicted pulsar pulse quantum theory quasars radar radiation redshift relativistic rest-energy rotating satellite Simple Universe slowdown spacecraft spaceship spacetime Special Relativity speed of light stars stein's sub-atomic particles supergravity telescope theorists theory of gravity time-traveller timeshells tion twin paradox white dwarf world-line X-ray