A macro (i.e. galaxy) bound system would have a characteristic radius. Inside this the system is bound. Outside it is not. The density is the mass per unit volume (taking into account the additional curvature created by the mass). Presumably there is a critical density/mass (as a function of...
Thanks.
So dark energy implies distant things get further apart faster, but close in, not so much?
Are galactic clusters considered bound systems? How close is close? Where is the edge? What is the curvature there? It would have to be not- changing and this sounds meta-stable.
I don't...
I wish this forum allowed indentation using tabs. Some of these questions are dependent on the answers to others. I have used outline numbers to indicate nested questions.
I have BA in physics and mathematics, 40+ years ago. I was thinking (always a dangerous thing). I had some questions. I...