Introductory Special Relativity book theory question
According to the examples often used in introductory special relativity theory books, if a spaceship leaves the earth and travels towards a far distant galaxy at near the speed of light. Then turns around and returns to Earth, perhaps 10 years will have passed for the traveler and perhaps 1000 years for the earthlings. Now if during the traveler's entire trip a continuous movie were made of the earth from the ship, it would have to show the frantic motion of everything on Earth traveling at tremendous speeds. Even chemical reactions, etc. would have to speed up so that 10 years worth of observer time would accomplish 1000 years or earth time efforts. Where does all the energy come from to increase the speed, kinetic energy, momentum, etc. of the stationary earthlings? According to theory the earthlings would notice nothing out of the ordinary? Even though they are moving around at very large velocities to get all that 1000 years worth of activity finished in the traveler's 10 years of observation.
