It is worth emphasizing that those distant regions of space are taken to exist and be part of reality as much as we are; yet we can never interact with them, even in principle. Even with most of the visible universe, we cannot interact with it in practice. A relatively simple task, so it might seem, would be to communicate within our galaxy. Even if we knew how to send a message successfully, it would be well over 200,000 years before a reply could come back from the far end of the Milky Way, whose diameter is 100,000 light years. galaxy. The spatial region which we can see is called the "observable universe".
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