Recent content by Tryggvas

Thank you very much for your explanations and clarifications. I fully understand that you cannot compare an acceleration or force with a velocity. I just thought it was strange that the tiny gravitational pull could have such a strong effect as to keep galaxy groups together, and suspected that...

Thought experiment: Assume two galaxies in a galaxy group, initially at rest (with respect to one another). The distance between the centers of the galaxies is r = 1 Mpc. The total mass of each galaxy is mg = 6 ∙ 1042 kg (including dark matter). This is ≈ 3 ∙ 1012 solar masses. The...

I am a retired engineer from Sweden, with some early university studies in mathematics and physics, but I worked with inforamtion technolgy most of my work life. After retirement, I have taken up an old interest, cosmology, and last year I attended a cosmology course at the University of...