... for, however, are his theories of relativity. The general theory of relativity deals with acceleration and gravity, while the special theory of relativity deals with energy, mass, and acceleration. According to the general theory of relativity, acceleration and gravity are the same force, and gravity has the effect of slowing time, i.e., as acceleration (gravity) increases, time slows down. This has interesting implications for future space travellers. For example, time will pass slower for an astronaut travelling at near the speed of light than it will for her friends on Earth. When she returns home, her spacecraft's chronometer might indicate that she had only been away for months, yet years would have passed for her friends on Earth. Experiments with time on Earth prove that Einstein's general theory of relativity is valid. Atomic clocks have demonstrated that time is slower at sea level than it is on a mountaintop. This ...

See this essay or coursework document in full right now