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20 ώρες πριν · Hubble's law, also known as the Hubble–Lemaître law, is the observation in physical cosmology that galaxies are moving away from Earth at speeds proportional to their distance. In other words, the farther they are, the faster they are moving away from Earth. The velocity of the galaxies has been determined by their redshift, a shift of the light they emit toward the red end of the visible ...
20 ώρες πριν · The time lapse between two events is not invariant from one observer to another, but is dependent on the relative speeds of the observers' reference frames. ... the distances x ′ to the end points of the rod must be measured simultaneously in that system S ... The classical calculation of the displacement takes two forms and makes different ...
