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No. The proper boundaries are between galaxy clusters, which remain gravitationally bound to each other. If you can reach a cluster such that its gravity is str
by garmaine 5y ago
No. The proper boundaries are between galaxy clusters, which remain gravitationally bound to each other. If you can reach a cluster such that its gravity is strong than the expansion of the universe, then you can reach every part of that cluster.
- lostmsu 5y agoDoes the mean, that the cluster, that is going to become unreachable next is going to "become" unreachable in its entirety in a single unit of time (like maybe Plank time)?
- lostmsu 5y agoTo answer myself: yes. The clusters close to the outer event horizon are moving away from us at the speeds extremely close to the speed of light. Correspondingly from our standpoint of view their length along that direction is extremely contracted, and gets closer and closer to infinitesimally small as they get closer and closer to the horizon.