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Stephen Hawking's Interstellar Spaceship Proposal (And More!)
Good question. Positronium is not an exact analogue of a hydrogen atom since
it consists of an electron and a positron (anti-electron) orbiting each other while the hydrogen atom has an electron orbiting around the much more massive proton. The highly advanced theory of quantum electrodynamics (QED) mentioned in the article describes how these states are stable or unstable. BTW, the production of antihydrogen is quite low: CERN snags 38 antihydrogen atoms in magnetic trap. http://arstechnica.com/science/2010/...ydrogen-atoms/ by Alexander B. Fry - Nov 17, 2010 11:11pm EST But theoretical work may allow the production rate to be ramped up: Physicists find ways to increase antihydrogen production. May 20, 2015 by Lisa Zyga http://phys.org/news/2015-05-physici...roduction.html Bob Clark ---------------------------------------------------------------------------------------------------------------------------------- Finally, nanotechnology can now fulfill its potential to revolutionize 21st-century technology, from the space elevator, to private, orbital launchers, to 'flying cars'. This crowdfunding campaign is to prove it: Nanotech: from air to space. https://www.indiegogo.com/projects/n...ce/x/13319568/ ---------------------------------------------------------------------------------------------------------------------------------- "ClutterFreak" wrote in message ... On Sun, 29 May 2016 09:19:21 -0400, Robert Clark wrote: http://physicsworld.com/cws/article/...zzle-is-solved Why same thing doesn't happend to hydrogen? -- |
#72
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Stephen Hawking's Interstellar Spaceship Proposal (And More!)
On Tue, 7 Jun 2016 09:51:05 -0400, Robert Clark wrote:
on. Positronium is not an exact analogue of a hydrogen atom since it consists of an electron and a positron (anti-electron) orbiting each other while the hydrogen atom has an electron orbiting around the much more massive proton. The highly advanced theory of quantum electrodynamics (QED) mentioned in the article describes how these states are stable or unstable. So the difference is made only by higher mass where the positive charge is, something as lame as just gravity at that scale, or is it much more involved having to do with what "mass" itself is? -- "Woade Hueoo" -extra thick-lipped Black American female intending to say "Walnut Hill" --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#73
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Stephen Hawking's Interstellar Spaceship Proposal (And More!)
On 6/7/16 9:51 AM, Robert Clark wrote:
Good question. Positronium is not an exact analogue of a hydrogen atom since it consists of an electron and a positron (anti-electron) orbiting each other while the hydrogen atom has an electron orbiting around the much more massive proton. So why isn't it made of a positron in orbit around an anti-proton? That would be an exact analogue, yes? -- Sea Wasp /^\ ;;; Website: http://www.grandcentralarena.com Blog: http://seawasp.livejournal.com |
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Stephen Hawking's Interstellar Spaceship Proposal (And More!)
DARPA is funding methods of getting separate components to self-assemble and
form larger satellites and also self-assemble to form robotic rovers: How Tiny 'SuperBots' Will Create Cheap, Modular Satellites. BY SOPHIA STUART JANUARY 14, 2015 1 COMMENT http://www.pcmag.com/article2/0,2817,2475070,00.asp Bob Clark ---------------------------------------------------------------------------------------------------------------------------------- Finally, nanotechnology can now fulfill its potential to revolutionize 21st-century technology, from the space elevator, to private, orbital launchers, to 'flying cars'. This crowdfunding campaign is to prove it: Nanotech: from air to space. https://www.indiegogo.com/projects/n...ce/x/13319568/ ---------------------------------------------------------------------------------------------------------------------------------- "Robert Clark" wrote in message ... You may be thinking of self-reproducing which is different from self-assembly. Self-assembly can be done at the macroscale. Considering the advances in nanoscale devices it should be doable at the nanoscale. Bob Clark ---------------------------------------------------------------------------------------------------------------------------------- Finally, nanotechnology can now fulfill its potential to revolutionize 21st-century technology, from the space elevator, to private, orbital launchers, to 'flying cars'. This crowdfunding campaign is to prove it: Nanotech: from air to space. https://www.indiegogo.com/projects/n...ce/x/13319568/ ---------------------------------------------------------------------------------------------------------------------------------- "Sjouke Burry" wrote in message ... On 22.05.16 22:48, Robert Clark wrote: Suppose we made the probes at the virus or bacteria scale then used self-assembly to form a macroscale spacecraft say size of Mars Pathfinder. Then we might only need a ground laser of currently existing size, say a few hundred kilowatts, to send multiple nanoscale components to relativistic speeds. Know of references for doing self-assembly with components at the nanoscale? Bob Clark You think that you can put a computer/assembly line inside a nano particle? Please show us how. It should be able to go after raw material in space,which needs oodles of energy. What useful amount of energy can you store in a nano particle? Where does the particle get the ions to to travel millions of miles? I think a minimal self-reproducing craft would weight several tons, and be anything but small. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#75
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Stephen Hawking's Interstellar Spaceship Proposal (And More!)
Alain Fournier wrote:
On May/22/2016 at 4:48 PM, Robert Clark wrote : Suppose we made the probes at the virus or bacteria scale then used self-assembly to form a macroscale spacecraft say size of Mars Pathfinder. Then we might only need a ground laser of currently existing size, say a few hundred kilowatts, to send multiple nanoscale components to relativistic speeds. Know of references for doing self-assembly with components at the nanoscale? As others have mentioned, this kind of self-assembly is rather far-out in the sci-fi zone. But even if you did have such self assembly, focusing your laser on something far away that is of nanometric size is yet another challenge far-out in the sci-fi zone. Alain Fournier ------------------------------------------ Those guys have too much money. Imagine looking at a planet which is 1400 light years away, a place where any member of the human race can never be, no matter how long he has to do it. DZ |
#76
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Stephen Hawking's Interstellar Spaceship Proposal (And More!)
Yes. In the post earlier today in this thread I discussed antihydrogen being
formed. Bob Clark ---------------------------------------------------------------------------------------------------------------------------------- Finally, nanotechnology can now fulfill its potential to revolutionize 21st-century technology, from the space elevator, to private, orbital launchers, to 'flying cars'. This crowdfunding campaign is to prove it: Nanotech: from air to space. https://www.indiegogo.com/projects/n...ce/x/13319568/ ---------------------------------------------------------------------------------------------------------------------------------- "Sea Wasp (Ryk E. Spoor)" wrote in message ... On 6/7/16 9:51 AM, Robert Clark wrote: Good question. Positronium is not an exact analogue of a hydrogen atom since it consists of an electron and a positron (anti-electron) orbiting each other while the hydrogen atom has an electron orbiting around the much more massive proton. So why isn't it made of a positron in orbit around an anti-proton? That would be an exact analogue, yes? -- Sea Wasp /^\ ;;; Website: http://www.grandcentralarena.com Blog: http://seawasp.livejournal.com --- |
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