In their novel Into Deepest Space Fred and Geoffrey Hoyle describe the experiences of astronauts in a spaceship which accelerates to near light speed away from our Galaxy. Before high velocities have been reached the travellers have a wonderful face on view of the galaxy through their rear window. By the time they are approaching the speed of light the Galaxy has disappeared from their rear window and is seen strangely altered through the front window. This is an example of aberration which is the change in direction of a moving object or light ray that accompanies a change of reference frame.