Well, every object is separated from you by a spacelike interval. If some distant object starts accelerating quickly enough, it may become forever inaccessible.
Also, an object distant enough on way-bigger-than-galaxy-superclaster scale can have Hubble speed more than c relative to us.
Also, an object distant enough on way-bigger-than-galaxy-superclaster scale can have Hubble speed more than c relative to us.
Are you sure about this? I don't understand relativity much, but I would suspect this to be another case of "by adding speeds classically, it would be greater than c, but by applying proper relativistic calculation it turns out to be always less than c".
From Costanza's original thread (entire text):
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