New posts in Observers

Does special relativity imply that I can reach a star 100 light years away in less than 100 years?

Do bats use special relativity when they use echolocation?

What is meant by coordinate time? Isn't it time measured on a clock? If not then what does it measure?

On what things can two observers agree or disagree?

Intrinsic Curvature of a Cylinder

Red- / Blueshifting and relativistic length contraction at $0.8c$ - How would it look?

Is Hawking radiation real for a far away observer?

How does brain perceive time dilation due to gravity?

Is the statement "The deactivation sensor sends a signal to disarm the bomb" frame-independent in the train-tunnel paradox?

What is the reason to believe that the laws of physics are same in all frames of reference?