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SVTPerformance's Chain of Restaurants
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Science nerds. Richard Dawkins and Neil deGrasse Tyson have a discussion.
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<blockquote data-quote="1hot281" data-source="post: 11588697" data-attributes="member: 88586"><p>I'd also like to take the time to explain a few things; </p><p></p><p>When we're talking about the universal horizon being roughly 14 billion light years away, <u>one</u>, that's a 14 billion lightyears radius, in any direction from earth, giving the "bubble" of the universal horizon a <em>diameter</em> of 28 billion lightyears... and <u>two</u>, for the universal horizon at topic here and in the OP video, we're referring to <em>light travel distance</em> (the distance the light/heat or whatever form of <em>information</em> has traveled by the time we observe it today)... not the comoving or proper distance, the position the objects we are observing are, in relation to earth's position at our <em>current time.</em> </p><p></p><p>Remember that anything we can currently observe in the universe, we are seeing it as <em>it was</em> when that light we are now receiving was first emitted. So objects we are observing, approximately 14 billion light years away <em>at the time the light was emitted</em>, we are seeing it in the past, at the crossroad where the maximum amount of time the light could use to travel to us, and the maximum amount of distance the light could travel in that time, intersect... </p><p></p><p>For the proper size of the observable universe, it really depends on which theory of cosmology you subscribe to, as variables in theory can greatly affect the outcome of the equations used. But for some of the most common theories, the distances that objects we can observe, are, at current time, because of the expansion of the universe, much farther away than we see them... The <em>estimated</em> present time proper distance to the edge of the observable universe, if the universe turns out to be flat (which some data suggests is true) is somewhere in the neighborhood of 46 billion lightyears... giving the present era visible/observable universe a diameter around 92 billion lightyears.</p></blockquote><p></p>
[QUOTE="1hot281, post: 11588697, member: 88586"] I'd also like to take the time to explain a few things; When we're talking about the universal horizon being roughly 14 billion light years away, [U]one[/U], that's a 14 billion lightyears radius, in any direction from earth, giving the "bubble" of the universal horizon a [I]diameter[/I] of 28 billion lightyears... and [U]two[/U], for the universal horizon at topic here and in the OP video, we're referring to [I]light travel distance[/I] (the distance the light/heat or whatever form of [I]information[/I] has traveled by the time we observe it today)... not the comoving or proper distance, the position the objects we are observing are, in relation to earth's position at our [I]current time.[/I] Remember that anything we can currently observe in the universe, we are seeing it as [I]it was[/I] when that light we are now receiving was first emitted. So objects we are observing, approximately 14 billion light years away [I]at the time the light was emitted[/I], we are seeing it in the past, at the crossroad where the maximum amount of time the light could use to travel to us, and the maximum amount of distance the light could travel in that time, intersect... For the proper size of the observable universe, it really depends on which theory of cosmology you subscribe to, as variables in theory can greatly affect the outcome of the equations used. But for some of the most common theories, the distances that objects we can observe, are, at current time, because of the expansion of the universe, much farther away than we see them... The [I]estimated[/I] present time proper distance to the edge of the observable universe, if the universe turns out to be flat (which some data suggests is true) is somewhere in the neighborhood of 46 billion lightyears... giving the present era visible/observable universe a diameter around 92 billion lightyears. [/QUOTE]
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Science nerds. Richard Dawkins and Neil deGrasse Tyson have a discussion.
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