Sound Waves from the Beginning of Time - YouTube - PBS Space Time - cosmology

with Dr.Matt O'Dowd PhD (astrophysics),writer and host of PBS Space Time* Cosmology is the study of the origin,evolution and structures of the universe.*The Baryonic Acoustic Oscillations are caused by pressure from photons,which are quanta,or packages of light,as Einstein put it.Photons were the radiation of the early universe.For Einstein's discovery of the photoelectric effect that underlies photons,he received the Nobel Prize in Physics.The Baryonic Acoustic Oscillations were first identified in 2005 by the Sloan Digital Sky Survey (SDSS) in the Northern Hemisphere and the 2DF Background in the Southern Hemisphere.