Recent content by kymner

To be clear, I am not talking about expansion at all but about the local velocities of the galaxies within their local clusters at distant times in the past. When expansion is taken into account there should be an additional velocity that gets larger faster as you go back in time that represents...

I'm aware that the expanding universe causes galaxies to move away at a velocity proportional to distance. However, I have some interest in the velocity that the galaxy was moving at the time in the past that we are seeing at present. This must be known about because the time dilation of...

I've been told that a photon doesn't lose energy as it travels through a vacuum because it doesn't experience time. However, general relativity states that any energy creates a gravitational field that travels away from the energy at the speed of light. Doesn't this imply that a photon once...