The Velocity Illusion. View the image with the centre covered. Then with the sides covered. Which perception of velocity is correct? Both? Neither?

The Unattainable Speed of Light

How does special relativity add velocities? Welcome to the world where 1 + 1 is not quite 2.

A letter poured in

I received a letter with some questions about special relativity. Here is a part of that letter:

…let’s say we hypothetically were able to send a space ship across space at…