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Stephen Hawking's Interstellar Spaceship Proposal (And More!)



 
 
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  #1  
Old June 7th 16, 02:51 PM posted to sci.physics,sci.astro,rec.arts.sf.science,sci.space.policy
Robert Clark[_5_]
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Default 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

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"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?
--

  #2  
Old June 7th 16, 05:44 PM posted to sci.physics,sci.astro,rec.arts.sf.science,sci.space.policy
ClutterFreak
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Posts: 2
Default 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"

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  #3  
Old June 7th 16, 06:57 PM posted to sci.physics,sci.astro,rec.arts.sf.science,sci.space.policy
Sea Wasp (Ryk E. Spoor)
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Posts: 127
Default 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

  #4  
Old June 7th 16, 09:07 PM posted to sci.physics,sci.astro,rec.arts.sf.science,sci.space.policy
Robert Clark[_5_]
external usenet poster
 
Posts: 245
Default 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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