Text Box: Although the estimated difference between these two times is exceedingly small, Michelson and Morley performed an experiment involving interference in which this difference should have been clearly detectable. But the experiment gave a negative result – a fact very perplexing to physicists. Lorentz and FitzGerald rescued the theory from this difficulty by assuming that the motion of the body relative to the æther produces a contraction of the body in the direction of motion, the amount of contraction being just sufficient to compensate for the difference in time mentioned above. Comparison with the discussion in Section XII shows that also from the standpoint of the theory of relativity this solution of the difficulty was the right one. ...Thus for a co-ordinate system moving with the earth the mirror system of Michelson and Morley is not shortened, but it is shortened for a co-ordinate system which is at rest relative to the sun.
Albert Einstein, Relativity, the Special and the General Theory, Crown, New York, 1961; p 52
Text Box: The Michelson-Morley Experiment is, in fact, a reconfirmation of the communion of atoms;
please see Mass-Energy , link below, for details.
At rest in an inertial system, atoms are always separated by an integer wavelength number between any two corresponding energy levels. In other words, the two levels exchanging energy are always in phase even in their so-called unexcited, or ground, state – irrespective of the velocity v, in magnitude or direction, of the inertial frame.
In (Max Born's) Fig. 61, above, once the experimental setup is fixed to show, say, a bright (high-intensity) patch in F, all atoms of the system then maintain the exact same number of wavelengths between corresponding levels. 
Being also in phase, arrival times of the two rays at F from Q would also show absolutely no difference. 
The three figures that now follow should make this important insight more lucid.
Text Box: An energy level of an atom is characterized by the frequency at which that level emits (or absorbs) energy, that is, relative to its body frame. Thus, under steady-state conditions, the frequency is independent of the direction of emission or the part of the level, or  'shell', from which it radiates. Depletion of energy from the atom, say, due to motion, also depletes energy from every such shell, resulting in a drop in this intrinsic frequency of the shell.  
All this is fine in theory; but verification posed the challenge. It is now well met in the situation depicted in Figure 8.
For the rest of the text, and derivation of formula λ' = λ(1 – v2/c2)–1/2, for the first time ever from first principles, please see the item for Page 77 in ADDENDA (link below), where S is considered a point source in relation to the distance RS (making v1 = v2 = v).
Text Box: In conclusion. 
After these two web pages on relativity, it would be but a simple exercise for the reader to explain fundamentally and intuitively all other phenomena related to the moving body, basically, the moving or vibrant  atom.
For instance, what fundamentally is heat or latent heat in the final perspective?
The list would go on to orbital, molecular and nuclear binding energies, etc., that we often come across in physics today. 
Fundamentally, of course, there is absolutely no difference between forms of energy.
Nevertheless, if there be the slightest problem in trying to understand any natural phenomena, do drop me an e-line with your question and  the explanation will come to you within days. An illustrated answer, too, will grace these pages if found appropriate.
Thank you.
     Go back to Part 1 of 2
A Synopsis The Cosmos The Spin
ADDENDA The Cosmological Redshift The Neutrino
Two-Slit Tests The Galaxy Nuclear Reactions
NASA Tests Gravity The Sun
KamLAND Test Anti-Gravity The Pulsar
UCLA Test Relativity Superconductivity
Q and A Mass-Energy Fusion Energy
 Eugene Sittampalam
 3 April 2009