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Aliens: Yes Or No?
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<blockquote data-quote="briggart" data-source="post: 9081571" data-attributes="member: 6805135"><p>That kind of depends on what you consider the Universe to be. The portion of the Universe from which we can currently receive signals has a finite size, since our Universe began 13.8 billion years ago. If the current phase of accelerated expansion will keep going on forever, we will ever be able to observe (or send signals to) a portion of the Universe that is 2-3 times larger than what we currently observe, even with infinite time. From this point of view, the Observable Universe is indeed finite. </p><p></p><p>But the Universe as a whole is larger than what we currently observe. We don't know if it is finite or actually infinite but, based on the properties of our region of space, we know that is must be at least 200-300 times larger than the currently Observable Universe.</p></blockquote><p></p>
[QUOTE="briggart, post: 9081571, member: 6805135"] That kind of depends on what you consider the Universe to be. The portion of the Universe from which we can currently receive signals has a finite size, since our Universe began 13.8 billion years ago. If the current phase of accelerated expansion will keep going on forever, we will ever be able to observe (or send signals to) a portion of the Universe that is 2-3 times larger than what we currently observe, even with infinite time. From this point of view, the Observable Universe is indeed finite. But the Universe as a whole is larger than what we currently observe. We don't know if it is finite or actually infinite but, based on the properties of our region of space, we know that is must be at least 200-300 times larger than the currently Observable Universe. [/QUOTE]
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