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Black Hole Image - livestreamed discussion from MIT on April 12th
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<blockquote data-quote="Umbran" data-source="post: 7590981" data-attributes="member: 177"><p>Fine question.</p><p></p><p>When I say it is "about the size of our solar system," I mean that in terms of order of magnitude - ballpark, within a factor of 10. To be more precise, I think it is actually more like a couple of solar systems across. </p><p></p><p><a href="https://xkcd.com/2135/" target="_blank">[ATTACH]105876[/ATTACH]</a></p><p></p><p><a href="https://xkcd.com/2135/" target="_blank">https://xkcd.com/2135/</a></p><p></p><p>If I got this correct from my reading, that's the size of its event horizon, the volume within which anything that enters, even light, cannot escape. </p><p></p><p>There is a common misconception about the effects near the black hole. I will instead, use our Sun as an example.</p><p></p><p>If, somehow, our Sun got compressed to the point where it'd become a black hole, the resulting event horizon would be something less than 4 miles across. And, while it would not be shining with light any more, in terms of gravity and the orbits of the other planets... they wouldn't notice. It would still seem like a mass the size of the Sun is sitting in the middle of the solar system. Nobody would be "sucked in", any more than the Sun sucks them in. There are a few things that seem strange to us when you get really near the event horizon, but they aren't actually new or weird effects - just the same things that make our ocean tides, written very large.</p><p></p><p>Now, the M87 black hole is some 65 *billion* times the mass of the Sun. So, it is sucking things in like 65 billion suns. But, that force drops off with the square of the distance from the event horizon, just like it drops off as you leave the Earth. There is nowhere between infinity and the event horizon where there's suddenly some new level of sucking.</p><p></p><p>Except on Mondays. Mondays suck more, obviously.</p></blockquote><p></p>
[QUOTE="Umbran, post: 7590981, member: 177"] Fine question. When I say it is "about the size of our solar system," I mean that in terms of order of magnitude - ballpark, within a factor of 10. To be more precise, I think it is actually more like a couple of solar systems across. [url=https://xkcd.com/2135/][ATTACH=CONFIG]105876._xfImport[/ATTACH][/url] [url]https://xkcd.com/2135/[/url] If I got this correct from my reading, that's the size of its event horizon, the volume within which anything that enters, even light, cannot escape. There is a common misconception about the effects near the black hole. I will instead, use our Sun as an example. If, somehow, our Sun got compressed to the point where it'd become a black hole, the resulting event horizon would be something less than 4 miles across. And, while it would not be shining with light any more, in terms of gravity and the orbits of the other planets... they wouldn't notice. It would still seem like a mass the size of the Sun is sitting in the middle of the solar system. Nobody would be "sucked in", any more than the Sun sucks them in. There are a few things that seem strange to us when you get really near the event horizon, but they aren't actually new or weird effects - just the same things that make our ocean tides, written very large. Now, the M87 black hole is some 65 *billion* times the mass of the Sun. So, it is sucking things in like 65 billion suns. But, that force drops off with the square of the distance from the event horizon, just like it drops off as you leave the Earth. There is nowhere between infinity and the event horizon where there's suddenly some new level of sucking. Except on Mondays. Mondays suck more, obviously. [/QUOTE]
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