11-14-2017, 03:22 PM | #261 | |||
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Join Date: Oct 2007
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Re: Lucy's Choice: Let's make Lucifer Parallels!
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And, yes, that would be quite the Lucifer parallel. Quote:
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Rob Kelk “Every man has a right to his own opinion, but no man has a right to be wrong in his facts.” – Bernard Baruch, Deming (New Mexico) Headlight, 6 January 1950 No longer reading these forums regularly. |
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11-14-2017, 03:29 PM | #262 |
Join Date: Feb 2016
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Re: Lucy's Choice: Let's make Lucifer Parallels!
Fragments 100 m across are the minimum size required to cause massive devestation on a local level, so I use it as an average. Anything smaller might destroy a village or a neighborhood, but 99% of that stuff before 1950 is going to land in the ocean, wilderness, deserts, or farmland, so it is not a concern. You might get a few 1 km fragments as well, but there will be so few of them that they will most likely miss the Earth (if any land, human civilization ends).
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11-14-2017, 04:16 PM | #263 |
Wielder of Smart Pants
Join Date: Aug 2004
Location: Ventura CA
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Re: Lucy's Choice: Let's make Lucifer Parallels!
Linear size isn't relevant, mass and velocity are. A relativistic black hole the size of a golf ball is still bad news.
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11-14-2017, 04:43 PM | #264 | |
Join Date: Jun 2006
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Re: Lucy's Choice: Let's make Lucifer Parallels!
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But no, nothing interstellar is going to be "captured" by the sun without it. By definition the energy you gain falling in from infinity is the escape velocity of the thing you are falling toward. To "capture" an object, its initial velocity would have to canceled out part of the velocity gained by falling toward the sun. But an object far from the sun that starts with a velocity vector pointing away from it was *closer to the sun* earlier, that's what it means to have a velocity away from the sun. That's something on the outward leg of an already existing orbit, not object coming in from interstellar space.
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11-14-2017, 04:44 PM | #265 |
Join Date: Feb 2016
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Re: Lucy's Choice: Let's make Lucifer Parallels!
A relativistic black hole will pass through the Earth like a bullet goes through air, but with less resistance. If the event horizon is the same diameter as a golf ball, it will consume around 22,000 metric tons of matter before leaving the Earth. It will not have enough time to create a measurable accretion disk, so it would probably only release energy equivalent to a couple of large nuclear weapons. You might get a few major earthquake, volcanic eruptions, and tsunamis triggered by the tidal effects, but they will be localized.
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11-14-2017, 05:15 PM | #266 | |
Join Date: Feb 2011
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Re: Lucy's Choice: Let's make Lucifer Parallels!
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11-14-2017, 05:19 PM | #267 | |
Wielder of Smart Pants
Join Date: Aug 2004
Location: Ventura CA
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Re: Lucy's Choice: Let's make Lucifer Parallels!
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At any rate a 100 meter long, 1 mm in diameter, aerogel noodle falling at 9.8 m/s/s would do significantly less. Edit: A black hole with a Schwartzchild radius of 1cm has a mass of 1.1 Earths, and if traveling at 70% of the speed of light, a kinetic energy of 2.4×10^41 or about 10^9 times the gravitational binding energy of the Earth. I am reasonably certain that would result in significantly more problems than than a few earthquakes. Last edited by sir_pudding; 11-14-2017 at 05:31 PM. |
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11-14-2017, 05:32 PM | #268 |
Join Date: Feb 2016
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Re: Lucy's Choice: Let's make Lucifer Parallels!
The object would pass through the Earth in 0.05s or less, so there is not enough time for major heating as the vast majority of the matter it would encounter would interact with its event horizon. The Earth might as well be vacuum to something with infinite density, so there would be very little interaction. At worst, you get a couple of localized disasters at the entry and exit points and a lot of confused scientists (the Tunguska Event anyone?).
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11-14-2017, 05:50 PM | #269 | |
Wielder of Smart Pants
Join Date: Aug 2004
Location: Ventura CA
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Re: Lucy's Choice: Let's make Lucifer Parallels!
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The atmosphere has a heat capacity of about 5.95×10^21 J/C, so in half a second it will heat up by about 2×10^19 C (which incidently is significantly hotter than Nitrogen plasma, so it isn't really an atmosphere at that point, more like an explosion). Last edited by sir_pudding; 11-14-2017 at 10:33 PM. |
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11-14-2017, 07:33 PM | #270 |
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Join Date: Oct 2007
Location: between keyboard and chair
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Re: Lucy's Choice: Let's make Lucifer Parallels!
That depends on the earthquakes. As Randall Munroe pointed out on page 290 of his book what if?, "the Death Star caused a magnitude 15 earthquake on Alderaan."
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Rob Kelk “Every man has a right to his own opinion, but no man has a right to be wrong in his facts.” – Bernard Baruch, Deming (New Mexico) Headlight, 6 January 1950 No longer reading these forums regularly. |
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