Time dilation happens when any object is traveling at a speed different than 0 m/s. But, its effects are negligible until the object is traveling at a minimum of 30.000.000 m/s, 1/10 of the speed of light in the vacuum. The more the object's speed approaches the speed of light , the slower the time goes for it. Example: if a spaceship is traveling at nearly the speed of light, when in the ship 1 year is passed, on Earth 10 years are passed.

 

 










An example of the effects of time dilation