Applications of Einstein's theory of relativity?

Answer 1

In terms of practical applications, perhaps the stand-out answer is GPS. The calculations necessary for GPS depend upon knowing time very accurately, both on the ground and in orbit. But, due to General Relativity, clocks in orbit will run faster than those on the Earth. The difference isn't huge, but it turns out to get the accuracy GPS delivers, you need to take this correction into account.

In general, anything requiring very good clock synchronization between clocks moving with respect to each other, or clocks experiencing different gravitational strengths, will need to take Relativity into account.

As to other applications outside of experimental physics, there aren't many others. That's because relativity generally applies to situations where you have high velocities, or large gravity, or when you are doing things that are sensitive to changes in length/time due to relative motion or gravity.

Answer 2

Relativity's applications are too numerous to mention here. It applies to all calculations regarding space flight, to determining the orbits of planets, asteroids, comets, to the functioning of the sun, to all devices that use electrons and photons for communications... the list goes on and on. The theory was so sweeping in its explanation of physics that it very nearly has applications in all of our modern technology.

Answer 3

None. Only theoratical hot air. For engineering calcualtions newtonian soutions are enough to calculate orbits etc.

Answer 4

time travel
gravitaional lensing
etc.
you can have a detailed answer by searching on google