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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: 11578419" data-attributes="member: 88586"><p>14 billion light years away is the "end" of our <em>horizon</em> in space. It's the farthest we can see, because with the Universe being 14 billion years old, the farthest we can see is how far light can travel in that time. 14 billion light years. We can't <em>see</em> beyond that horizon because the light beyond that horizon would need longer than 14 billion years to reach us... which is older than the universe.</p><p></p><p>Space doesn't end at 14 billion lightyears away. We just simply can't see beyond that distance due to the time it takes the light from distant stars, galaxies, and other phenomena to reach us. </p><p></p><p></p><p></p><p>So when he says "nothing" is beyond our universal horizon, he means that a telescope could never see beyond 14 billion light years. There's nothing to see because there's no way any information (light) could have been sent from farther away and reach us in the time available. He doesn't mean that there's no universe beyond 14 billion lightyears away. </p><p></p><p></p><p></p><p>So, for an alien species 13 or 14 billion lightyears away, they could see 13 or 14 billion lightyears <em>farther</em> than us, relative to us here on Earth.</p></blockquote><p></p>
[QUOTE="1hot281, post: 11578419, member: 88586"] 14 billion light years away is the "end" of our [I]horizon[/I] in space. It's the farthest we can see, because with the Universe being 14 billion years old, the farthest we can see is how far light can travel in that time. 14 billion light years. We can't [I]see[/I] beyond that horizon because the light beyond that horizon would need longer than 14 billion years to reach us... which is older than the universe. Space doesn't end at 14 billion lightyears away. We just simply can't see beyond that distance due to the time it takes the light from distant stars, galaxies, and other phenomena to reach us. So when he says "nothing" is beyond our universal horizon, he means that a telescope could never see beyond 14 billion light years. There's nothing to see because there's no way any information (light) could have been sent from farther away and reach us in the time available. He doesn't mean that there's no universe beyond 14 billion lightyears away. So, for an alien species 13 or 14 billion lightyears away, they could see 13 or 14 billion lightyears [I]farther[/I] than us, relative to us here on Earth. [/QUOTE]
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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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