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[Phys-l] Big Bang density



The cover story on the current (April, 2009) issue of Astronomy is, Why
The Universe Had No Beginning. Astronomers claim that at this time, the
universe had infinite density (zero volume). This has puzzled me for some
time. Isn't there a "maximum" density for matter? I mean, stuff is
composed of fundamental particles which supposedly have mass and take up
space. Or maybe their wave-like properties change this? Maybe the physical
laws as we know them today were somehow much different during this time?
Still, I find it difficult (mind boggling!) to understand that all the
matter in the entire universe was compressed into a single point.

Does anyone know how this infinite density idea can be explained? Is it
being challenged by anyone in the scientific community? Or is this
something we all have to accept?