----------------------------------- Mircea Pteancu 08 Mai 2016 17:35 ----------------------------------- La acest link veti intalni un subiect foarte ciudat si anume ''Muzica sferelor''. Este vorba despre ''muzica'' pe care o canta stelele variabile. Dupa cum zice Kollath Zoltan , autorul sitului : ''...For a well-defined group of stars there exists a self-excitation mechanism which is capable of generating steady standing waves inside the distant suns. These waves are analogous to the waves inside organ pipes or other wind instruments.These stars are called (pulsating) variable stars.... .... Variable stars expand and contract in the course of wave motion. When the sphere contracts its temperature increases and the brightness rises, and when the star expands its light intensity decreases again. This makes it possible for earthlings to observe the acoustic waves of stars by measuring or estimating the light variation of heavenly bodies. The period of stellar oscillations extends from minutes to years, e.g. the range of frequencies is about 20 octaves wide compared to the 10 octave range of the audible sounds. Furthermore, even the highest pitch of the stars is approximately 15 octaves lower than Middle A! This makes it necessary to transpose the wide range of stellar pulsations to make them audible. The sounds of stars when transposed to perceptible frequencies, however, provide an interesting ensemble of stellar (musical) instruments. ...'' http://www.konkoly.hu/stellarmusic/index.html Pe pagina ''Music'' pe care o putem deschide cu butonul din stanga sus , gasim niste transpuneri in registrul audibil al fenomenelor de oscilatie luminoasa ale variabilelor. Deci si a sunetelor care se propaga in interiorul propriu-zis al stelelor dar si traducerea in registrul sonor audibil al comportamentului din spectrul luminos al stelelor variabile. Este uimitoare afirmatia referitoare la existenta unui mecanism de auto-excitatie capabil sa genereze la distanta unde stabile intr-un grup dat de stele. Muzica Sferelor ...la propriu. Cine ar fi crezut ! Mircea