AS102 Study Guide - Final Guide: Cosmic Microwave Background, Edwin Hubble, Photon
Document Summary
The big bang theory, as described in the previous lesson, is quite a theory and a tribute to mankind"s ingenuity. However, once edwin hubble discovered that the universe is expanding as expressed through hubble"s law it became pretty clear that if you run time backwards the universe gets increasingly smaller. If we assume that the universe is roughly 14 billion years old (really it"s. Let"s go back another 3. 5 billion years so the universe is now its present age and the galaxies should be about their current separation distance, and so on. Clearly, as we run time backwards, getting closer to 13. 8 billion years ago, the size of the universe must have been extremely small and all that energy was packed into a very small space. It"s there, all around us, with exactly the wavelength predicted by the theory. It turns out the two physicists working at bell laboratories in.
