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Aliens: Yes Or No?
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<blockquote data-quote="Umbran" data-source="post: 9081686" data-attributes="member: 177"><p>I believe current understanding is mostly that what you say here is incorrect.</p><p></p><p>There is finite space in the <em>observable</em> universe, because our observations are limited by the speed of light. However, there is nothing particularly weird that happens at the edge of that observable universe - implying the universe just... continues beyond that.</p><p></p><p>Our observations within the observable universe are that it is, on large scales, perfectly flat - it doesn't curve back in on itself, or curve outwards. We know that to within about one part in 400. Barring any reason to assume that the universe radically changes outside the visible part, that means the overall universe is at least 400 times the radius of the visible universe - which means the full universe has at least 64 million times as much space as we can see, and no particular reason to think that it curves back in on itself at all.</p><p></p><p>There is a known limit to time in the backwards direction - the big bang is t=0 on the great cosmic clock, because "time" as such doesn't exist before that point - indeed "before that point" is a meaningless statement. But, we don't see sign that time is curved back on itself either. And while the universe might continue forward in time to the point of heat death, after which time is... pointless, I guess is the right word, there's no particular reason to think time just <em>stops</em> in the forward direction any more than to think that space just <em>stops</em>.</p></blockquote><p></p>
[QUOTE="Umbran, post: 9081686, member: 177"] I believe current understanding is mostly that what you say here is incorrect. There is finite space in the [I]observable[/I] universe, because our observations are limited by the speed of light. However, there is nothing particularly weird that happens at the edge of that observable universe - implying the universe just... continues beyond that. Our observations within the observable universe are that it is, on large scales, perfectly flat - it doesn't curve back in on itself, or curve outwards. We know that to within about one part in 400. Barring any reason to assume that the universe radically changes outside the visible part, that means the overall universe is at least 400 times the radius of the visible universe - which means the full universe has at least 64 million times as much space as we can see, and no particular reason to think that it curves back in on itself at all. There is a known limit to time in the backwards direction - the big bang is t=0 on the great cosmic clock, because "time" as such doesn't exist before that point - indeed "before that point" is a meaningless statement. But, we don't see sign that time is curved back on itself either. And while the universe might continue forward in time to the point of heat death, after which time is... pointless, I guess is the right word, there's no particular reason to think time just [I]stops[/I] in the forward direction any more than to think that space just [I]stops[/I]. [/QUOTE]
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