Physics

quark content of nucleons
On the off chance that there are still some physicists lurking here - is it possible to give an intuitive explanation of why spin 1/2 baryons with three same-flavour quarks do not exist? A wikipedia article says "because of Pauli exclusion", but I can't see how to use this. On a similar note, is there a way to e... 6 Jan 2010 09:30

What happens when all dimensions are doubled overnight?
Suppose you are told that the linear size of everything in the univers has been doubled overnight. 1. Can you test this statement by measuring the sizes with a metre stick? 2. Can you test it by using the fact that the speed of light is a universal constant and has not changed? 3. What will happen if all th... 6 Jan 2010 11:59

Space shuttle for space tourism and first stage of a TSTO.
This article describes the plan to sell the orbiters minus engines for $42 million: For sale: Used space shuttles. Asking price: $42 million apiece By John Matson Dec 18, 2008 04:00 PM in Space http://www.scientificamerican.com/blog/post.cfm?id=for-sale-used-space-shuttles-asking-2008-12-18 It is currently ... 26 Jan 2010 12:05

Eclipses Yield First Images of Elusive Iron Line in Solar Corona
"Ground-based observations reveal the first images of the solar corona in the near-infrared emission line of highly ionized iron, or Fe XI 789.2 nm. The observations were taken during total solar eclipses in 2006, 2008, and 2009 by astrophysicist Adrian Daw of NASA’s Goddard Space Flight Center in Greenbelt, Md., w... 6 Jan 2010 09:27

Quantum Gravity 352.4: Correspondence Between Volterra Integral Equation and Probable Causation/Influence (PI)
From Osher Doctorow Although t is a dummy variable in I...dt, when I goes from a to tau, t "traverses Memory". This is clearer in Wikipedia's article on Volterra equations: 1) f(t) = I K(t,s) x(s) ds (Volterra integral equation of 1st kind, I...ds integral from s = a to s = t) 2) x(t) = f(t) + I K(t,s) x(... 6 Jan 2010 09:26

Continuity -vs- Discreteness
Calculus was extremely successful in modelling natural phenomena. Cellular automata has also been extremely successful in modelling many of the exact same phenomena. Suppose for a moment that any natural phenomena can be modelled with equal accuracy using either Calculus or Cellular Automata. Can we say that d... 13 Jan 2010 10:57

There is just *one* kind of mass!!
9 sent a new thread and for some reason i cant see it so let me try again: Let us take an example case: a mass (say electron or Proton) is starting to move at a low velocity v1 and therefore has momentum P1 = mv! later it is accelerated to a much hifger velocity P2 = mv2 say v2 very close to c !!! ... 23 Feb 2010 21:38

 Eric Gisse promotes my web·site ( www.JeffRelf.F-M.FM ).
 <PRE> You ( <A href="http://jeffrelf.f-m.fm/Eric Gisse 2009 in FairBanks Alaska.jpg">Eric Gisse</A>, “would be” net·cop ) imagined: “ <A href="http://jeffrelf.f-m.fm/">Relf's site</A> is still down, too. ”. No, YOU LOST and FastMail.FM* won. ( *: running nginx on Linux ) Thanks for the promotion; I'd return ... 3 Jan 2010 16:04

Our 0.1<1% hollow moon, and near infinite vacuum of Selene L1 / Brad Guth
On Jan 2, 10:34 am, Nightcrawler <Dirtyde...(a)dirtcheap.net> wrote: On 1/2/2010 12:07 PM, BradGuth wrote: Where’s the objective evidence that our Selene/moon is not the least Where's the objective evidence that Guthball has a brain? "Our 99% hollow head of Guthball once again spewed..." In other w... 1 Apr 2010 01:27

best way to trashcan Nebular-dust-cloud is **neighborhood star ages** Re: (use in 4th) Earth about 10 billion yrs old; Atom Totality theory (use in 4th)
Archimedes Plutonium wrote: Sam Wormley wrote: Age of solar system needs a fresh look http://www.sciencenews.org/view/generic/id/52306/title/Age_of_solar_system_needs_a_fresh_look Honed measurements show age overshot by amount significant to earliest stage of formation. Keep up the good... 1 Jan 2010 16:18