What is the use of time dilation.

[Brucezhou]

I mean the application,such as because of the time dilation, humans can observe some particles which don't have long lifetime,and know it

 

[Dale]

See here: http://www.edu-observatory.org/physics-faq/Relativity/SR/experiments.html#Tests_of_time_dilation

 

[phinds]

For a use of time dilation (both gravitational and because of motion), check out the GPS system. If it had been built using classical mechanics, it would have you driving in corn fields and into buildings instead of on the roads.