Special Relativity, Space Time

Special relativity described by Albert Einstein in 1905 supossed that time and space were not fixed entities.

At near-light speeds the time measured by one observer in movement and another observer static, will be different.
The same happens with the space. Something travelling at near-light speed will be seen smaller than seen by one static observer.
Time dilation has been checked using atomic clocks, and fast airplanes. The clock in plane an the one on Earth measured different times. These results imply strange events as Twin Paradox.

Time dilation and length contraction can be calculated using Lorentz Transformations programmed in this app.

Update: adds have been removed